I think the first card was from the early sixties and the last, the only time I saw a colored one, was from the late eighties when the studio moved out of central London.
Christmas cards part two is in the December 2014 archive
On a short visit to Moscow in 1987 I couldn't find anything to buy of interest to a designer apart from a pleasant paperback (in English) about the Moscow metro, a slim landscape book of maps of the USSR's rail routes (with, no doubt, hopelessly inaccurate maps as was the style back then) several sets of badges and this really lovely graphic book about Lenin.