As stated in my reply to your previous thread, the bicycle is a 1989 or 1990 model. This is based on the decal style. It fits well with the rear derailleur date code, which is in the grey area and could represent either model year. However, the Alpha 2000 derailleurs were only in production for 1988 and 1989, being replaced in 1990 by the AC 2000. This should make the bicycle a 1989 model, unless the manufacturer had a large stock of left over Alpha 2000 derailleurs.

Any further attempt to corroborate the model year would require the frame's serial number and even this may not be conclusive, as by this time the brand had been acquired by Derby Int'l, who was contracting new manufacturers. Still, the data would be appreciated, as it may prove valuable in decyphering Derby era serial number formats.

As for the "EX" on the front derailleur, I suspect it may be part of the model number. For instance, the Alpha 2000 rear derailleur had the the model number RD-2000-GX. I wasn't able to find a model suffix EX but it does fit the format and is too large for the traditional date code. There does appear to a double character stamp below the "VIA" designation that may be the actual date code.