I don't know the worth, but I have one from the same year with a full Chorus group and it rides like a dream. Good enough for Sean Kelly, good enough for me!
if this is for the splined, 1950's crank, I was looking as well and then a bunch popped up in a row on Ebay in the US. I ended up using a gear puller from an auto mechanic once and it worked quite well. Easier on the left side than the right!
Good luck
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LFGSS
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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two words: Yellow Spot!