I'm trying to date this Marshall 1936 (2x12) cab and am turning up with nothing. By my guess, it's late '80s, but I don't know squat about Marshall serial #s, etc. Here are some pics, if that helps at all...

It's got the JCM 800 Lead Series badge in the lower left

G-12T-75s, with an earlier label than on the pre-JCM 900 800 Series models from 91-92 that I've seen...

Serial is #4696 - that means nothing to me! One thing that's throwing me off is the 130W rating. Most of the ones I've seen are either 140W (mid 80s) or 150W (89/90-92).
Any clues?
Thanks!