Hi Kasper,
I suppose that Your interesting Casio has the same module as the TRW 10 (module 834):
http://www.digital-watch.com/DWL/1work/casio-trw-10/Under my current knowledge, there were also a Casio Soccer Timer, the TM 11 released also in 1992 which has Football Timer written on its original bracelet and the FIFA World Cup 1994 Casio watch, having Football Timer written on the original package:
http://www.ebay.com/itm/Casio-Vintage-R ... 1935055616? and
http://forums.watchuseek.com/f17/casio- ... 25246.htmlFrom what I know as the owner of some interesting Casios :), it was an interesting "habit" for Casio in the late 80's-early 90's to produce watches with the same module, but with different variation of the case (e.g. plastic-versus metal bezel-versus SS case and a specific version eventually sold only on a particular market - like Japan, thus being much harder to find on today collectors market):
A good example is the famous Moon Graph GMW-15 watch (plastic case, module 832 - the most common one), that had also at least 2 "metal" case variations with the same module: the hard to find grey metalic case GMW 61 and the rarest golden metalic case GMW 62 (it seems that those 2 ones was sold mostly on Japanese domestic market, thus are relatively hard to find elsewhere).
http://www.digital-watch.com/DWL/1work/casio-gmw-61/http://forum.pocketcalculatorshow.com/t ... moon-graphAnother example is from the Casio TRW series: the tachymeter TRW 21 (plastic case, module 861) had also a much rare brother - the TRW 201 (same module, SS case and TACHY METER inscription on the bezel)
http://raredigitalwatches.com/sonstige13.htmlhttp://www.nhtwatches.com/Watchesgaller ... ategory/33etc etc
To conclude, Your watch seems to be a very rare case variation (personally I've never seen one like this) of the more common Casio TRW 10 Alarm Chrono and named accordingly TRW 80, probably because the TRW 100 name was already taken by the sailing timer Casio watch from 1992
.
May I ask for more good quality photos, also of the caseback?
Thanks in advance!
Regards,