Because of the look of the sculpt I've just spent an hour going through all the Citadel catalogues and flyers from the mid-late '80s. I eventually found yer man on eBay. 1990 according to the tab (so at least a year later than where I was looking). Not sure if it's cool to post a link (so I won't), but that would tally with the page from WD 133 shared by aiteal.