This came today, from the Netherlands. It is a Cornavin with a Zim 2602 15J movement and with the Moscow Olympics dial from 1980.
There is some discussion re Cornavin in the Russian forum e.g., https://forums.watchuseek.com/f10/pet...nt-412645.html and https://forums.watchuseek.com/f10/cor...ch-171339.html
Chascomm thinks the Olympic dials may be dodgy. But I only paid $2.25 (that's £1.37) and even with $10 postage its cheap. And it works and has a nice Italian leather strap.