@WandelKonigin I think the main difference is that the 1980's pieces don't have crenelated rooks and the knights are simpler. I ended up getting a 1980's set but I really like the more detailed 1950's style Latvian
Oh I did see the knight with less detail in an article on how the “Gulag knight” evolved from 1950 to 1954. I had no idea the rook also lost detail. It seems this process of abstraction already took place in the mid ’50s then.
Another image 54 :
Ah yes, I recognize the 1954 knight from a recent article I read, called ‘The Gulag Knight of Mordovska (Addendum)’. Unfortunately the article is currently not accessible for some reason. But it showed how the knight evolved from 1950 to 1954, losing its detail and acquiring a thicker muzzle. Interesting to see the rook losing its segmented top, as Tarkinz stated.
Here is my 1952 set for reference. I’m not noticing any other changes.