Sharoma Casio Watches

Casio Watches

I have been a Casio fan since the late '80s and that is trivial. I've owned many of them. That also puts me alongside potentially billions of people. As capitalism continues to consume itself in a never ending desire to extract everything it can from the land and the consumers on it, Casio continues to make products with that golden combination of quality and affordability. Anyone can afford at least a couple! With all this in mind, I present my little Casio page, dedicated to that timeless classic on your wrist.

On the Eighth Day, we synchronize...

Watch Synchronization

Model AE-1200WH AQ-S800W STR-300 Pocket A158W Fake W-86 WVA-M630 GW-M5610U Timex F-105W F-94W W-217H W-59 W-96H W-86 (2) F-91W
Module 3198/3299 5208 2575 n/a 593 n/a 3298 5161 3495 n/a 3298 1071(B) 3454 590 3239 3298 593
8 Mar set set

8 Apr -20 +4 set

8 May -18 +6 +1 set

8 Jun -17 +2 +4 +4 set set

8 Jul -22 +5 +4 +2.5 -0.5 +3:26 set

8 Aug -17 +6 +5 +4 +0.5 +3:40 +9 0

8 Sep -17 +6 +5 +3 +0.5 +3:40 +10 0 0 set

8 Oct -17 +7 +3 +4 +1 +3:32 +9 0 0 +7 set set

8 Nov -18 +7 +2.5 +3 +0.5 +3:37 +10 0 0 +6 +7 +5 set set

8 Dec -18 +6 -1 +2 0 +3:30 +9 0 0 +6 +7 +5 -2 +6 set set
Model AE-1200WH AQ-S800W STR-300 Pocket A158W Fake W-86 WVA-M630 GW-M5610U Timex F-105W F-94W W-217H W-59 W-96H W-86 (2) F-91W
Module 3198/3299 5208 2575 n/a 593 n/a 3298 5161 3495 n/a 3298 1071(B) 3454 590 3239 3298 593
8 Jan -18 +7 0 +2 +0.5 +3:36 +9 set set +6 +8 +5 -1 +6.5 -11 +7.5
8 Feb -18 +7 -1 0 +0.5 +3:36 +8.5 +12 +7 +6 +8 +5 -1 +6.5 -10.5 +7.5 set


Casio watches listed in the table above contain varying modules and are accuracy rated to ± 30 seconds per month (with two exceptions). The table is intended to monitor this specification over time. I use as my reference and the 8th day of the month just happened to be when I decided to begin. Between 1100 and 1200 (MST) of the 8th is when every watch is synchronized with the reference. The figure below represents how far each watch was out by the 8th of the following month. 'Fake' indicates a fake F-91W I purchased at Canadian Tire for testing purposes. The watch labelled 'Pocket' is not a Casio model. It is a modern quartz analogue watch with battery power and is included for curiosity. 'Timex' is a quartz analogue watch of unknown model number which I purchased at Sears in 2006. My AE-1200WH ('Casio Royale') displays the 3198 module number in the diagnostic screen but 3299 is printed on the rear.


Superior Casios

Listed in the table above is the Casio WVA-M630 Wave Ceptor and the Casio GW-M5610U. These watches synchronizes daily with the WWVB transmitter at Fort Collins, Colorado which is approximately 1,800km from my location. Since they don't need a manual sync, the 0 in the table above represents whether each was accurate to the second with the information at These two watches also features a superior quartz movement to the other Casios listed above, being rated at ± 15 seconds per month. When auto sync is disabled for testing, these watches will be marked set.


The STR-300 is stored in a separate room to all the others. This room is unheated at night. Perhaps this accounts for its change in the cold winter months.

Sync sensitivity

The WVA-M630 Wave Ceptor rarely fails to sync each night, despite it lying flat and far from the window. The G-Shock GW-M5610U is more sensitive and will often fail to sync unless it is close to the window and pointed approximately south-east. However, it can still sync during the day when set up ideally.

Bulova Hack

The movement inside this watch is a Miyota 82S0, which is an automatic mechanical kind, not quartz electronic. It is rated for -20~+40 sec/day with a running time of 42 hours. This movement requires wrist movement or manual winding. Since it isn't accurate enough to be rated monthly, it shall be tracked daily in the table below. Between 1100 and 1130 each morning the time shall be checked and adjusted according to the reference. NR inidcates I forgot to take a reading or set the watch. FW indicates I forgot to wind the watch, meaning it had stopped.


January February
8th set +15
9th +8.5 +14
10th +9 +10
11th +8 +13
12th +8 +13
13th +9 +11
14th +8 +12
15th +10 +13
16th +10 +10
17th +9 +10
18th +9.5 +16
19th +11 +14
20th +9 +10
21st +10 +7
22nd +10.5 +8
23rd +11 +9
24th NR
25th +24
26th +9
27th +10
28th +10
29th +15
30th FW
31st +12.5

Casio W-86

The Casio W-86 is an old favourite, since it was the one I wore throughout my 20s. I bought my first one in March 2003. At the time I chose it because "for an extra couple of quid" you got a way better backlight and increased water resistance. The original strap lasted until 2009; the replacement lasted around a decade and can be seen in the pic. Since the W-86 was priced at £12.99 at the beginning of 2023, it led me to thinking about its cost over time. I can't remember exactly what I paid in 2003 but I think it was £7.99. Anyway, indulging a wave of nostalgia I pored over every Argos catalogue I could find from 1995 onwards, since that was the year of the W-86's introduction. Sadly, I cannot find any Argos catalogues for the year 2000 onwards. If you can provide data on the price of the Casio W-86 from spring/summer (S/S) 2000 until autumn/winter (A/W) 2022 (or anything in between) I would be very grateful.

Table of Cost, W-86

All my Casio W-86 models were purchased from Argos in the United Kingdom using GBP (£). Prices are taken from the old catalogues. These can all easily be found online. The Bank of England Inflation Calculator was used to obtain the amount in 2023.

Year Season Price in £ (GBP) March 2023 amount (GBP)
1995 A/W 14.99 28.75
1996 S/S 14.95 27.99
1996 A/W 14.95 27.99
1997 S/S 14.95 27.49
1997 A/W 14.95 27.49
1998 S/S 12.95 23.45
1998 A/W 12.95 23.45
1999 S/S 12.95 23.14
1999 A/W 9.95 17.78

2003 Spring 7.99~ 13.63~

2023 Spring 12.99
2023 Summer 16.99
2023 Autumn 12.99
2023 Winter 16.99
2024 Winter 12.99
2024 Winter 16.99

The cost of the W-86 at Argos in the first half of 2023 ranged from £12.99 to £16.99. This is an average of £14.99, which in 1995 was the equivalent of approximately £8. Therefore, the price of the W-86 has halved since its introduction, even accounting for the recent increase in price. In this inflationary system, this should be commended.

Casio W-86 Imperfection

I think the later W-86 models feature a more grey than black finish, though I cannot confirm this as items fade over time. One thing I have noticed on my 2023 W-86 is this minor imperfection. If you don't notice it in that pic, try this one. I've also seen it in some other, presumably later, W-86s online, such as this one. Starting above the 'S', peaking above the first 'A', ending over the 'HR' of CHRONO. The plastic lip is out of alignment in some way, causing a white mark to appear. It's not a reflection from flash, and if you look on the corresponding spot opposite on the face, the imperfection isn't there. On my 2003 era W-86, I didn't notice it, but I'd be interested to see others. Have you noticed this on your W-86? Let me know!

Casio W-86 Modules

To quote this review of the W-86:

Throughout its history, the W86 has undergone some variations in its internal mechanism. The early models used modules 1275 and 1572, while the newer variants use module 3298.

The full model name of the current variant is W-86-1VQES.

Lost Watches

In this section, I will list the watches I have owned and worn but no longer have. This is testament to the fact Casio watches were disposable objects, even to people who enjoyed them. Maybe they still are disposable to many people, though not disposable in a derogatory sense. For the 1980s, 1990s, and 2000s, many millions of people wore out and got rid of their beloved Casios. Often it was more economical to replace the whole unit rather than a strap, a battery, or even a gasket. Many people just 'lost' them, or can't really remember what happened to them. Some were of course stolen or donated to family and friends. Here is a perhaps incomplete list of my lost watches:

Make Model Release Year Year Owned Fate
Unknown Thomas the Tank Engine analogue Unknown ~1987 Unknown
Zeon James Bond 007 Official Quartz Watch 1985 ~1988 Gifted to Kris
Casio F-91W 1989 1993 Unknown
Unknown (Multi-dial blue face analogue) Unknown ~1995 Unknown
Unknown Baby-G Fake Unknown ~1996 Unknown
Casio CA-53W 1988 1998 Unknown
Casio W-86 1995 2003 Memorialised

Watch Lifespan

The first digital watch I remember owning was this bad boy, a marvel which had a musical themed output. I gave it to my friend Kris as a gift. I wonder if he still has it? I remember a rainy day sometime in 1989, observing my father constructing a camp, hammering down tent pegs, with a friend. I asked him "What's the new watch you're wearing? Where is your other one?" He stopped hammering, showed it to me and said "That's me knockin' watch!" His friend grinned. The watch in question was either a Casio W-59 (1982) or the newly released F-91W (I was six, so it's a long time ago and coincides with the F-91's release year). I now understood what a beater watch was. What I still fail to understand, is why anyone would want a watch you couldn't wear while camping. Anyway! I owned my own F-91W before long. Both of these watches are long gone. In 1998 I bought myself the classic calculator watch (Casio CA-53W) and avoided being mugged when the lads who potentially wanted my watch scoffed upon seeing it. The joys of England. That watch is also lost to the midst of time. In early 2003 I purchased my first Casio W-86 to begin my first factory assignment. It served as you would expect: without flaw. How long for? Well, in late 2017 it was still able to beep me awake to catch a flight to the UK. It died sometime in 2019. 16 years! I should state that it spent a large amount of time between 2012 and 2017 sat in a drawer. My final anecdote for the W-86 consists of an unoriginal and inaccurate remark made by a customer at Canadian Tire in 2009: "that watch looks like you should be in the '80s" (or words to that effect).

Last updated: February 23rd, 2024.