The set is a reproduction of the set used in the Spassky-Fischer World Chess Championship match of 1972.
There were two very identical sets, one used in the 3rd game, and the other for the rest of the games.
The 3rd game one was given to Guomundur Thorarinsson, the President of the Icelandic Chess Federation as a birthday present in 1972. It was sold some years ago for $67,500 plus 13% buyers premium of $8775 for a total of $76,275.
The other set is now in The Chess Memorial Museum in Reykjavik.
Boris Spassky vs Bobby Fischer chess set from 1972 Game 3. Photo ©http://weissauctions.auctionflex.com.
The chess set is really similar to a Jacques set from 1960
About the match. From an except from wikipedia (https://en.wikipedia.org/wiki/World_Chess_Championship_1972)
"The World Chess Championship 1972 was a match for the World Chess Championship between challenger Bobby Fischer of the United States and defending champion Boris Spassky of the Soviet Union.
The match took place in the Laugardalshöll arena in Reykjavík, Iceland, and has been dubbed the Match of the Century.
Fischer's win also ended, for a short time, 24 years of Soviet domination of the World Championship.
The first game was played on July 11, 1972. The last game (the 21st) began on August 31, was adjourned after 40 moves, and Spassky resigned the next day without resuming play.
Fischer won the match 12½–8½, becoming the eleventh undisputed World Champion.
In 2016, former World Chess Champion Garry Kasparov commented on the global significance of the match, saying:
I think the reason you look at these matches probably was not so much the chess factor but to the political element, which was inevitable because in the Soviet Union, chess was treated by the Soviet authorities as a very important and useful ideological tool to demonstrate the intellectual superiority of the Soviet communist regime over the decadent West. That’s why the Spassky defeat [...] was treated by people on both sides of the Atlantic as a crushing moment in the midst of the Cold War."
Bought in 2015 in Official Staunton (http://officialstaunton.com/).
Boxwood and ebonized boxwood, not weighted.
This set has a king of and a pawn of. It suits best in 60mm chessboards.
This is possibly the most accurate reproduction in market of the original set, with and extremely good carving quality.
Sources
https://www.chess.com/forum/view/chess-equipment/fischer-spassky-set