>>3614030Nope it was glue residue from my dumbass after trying to CLA it. Here was the before (from the ebay listing)
This is the link to the lens I bought (accidentally bought two but they're both in great shape, and the test pictures look decent). Doesn't look like it will take much to clean up and get to pristine condition again.
https://www.ebay.com/itm/034-TESTED-EXC-034-CANON-50mm-f1-8-Leica-screw-mount-L39-LTM-From-JAPAN-/274239609509?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%3AIT&nma=true&si=HwUd37zoYSioTFEouGSZtZH0wBE%253D&orig_cvip=true&nordt=true&rt=nc 