cast in number 261 on thread counter gear

Yup, zinc pest. My Atlas mfc suffered from that. 99% of the zamak on it disentegrated, or swelled up and siezed in the bores.
 
This seems to be the typical experience. Maybe one in ten machines show the problem, and (assuming that all of the Zamak parts are from the same time frame), either all of the pieces or none of the pieces are affected. My personal experience with three machines (two mills and a lathe) from the early 40's, early 50's, and late 70's is no problems. Maybe I shoulda bought a Lottery ticket. ;)
 
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