Swartchild Assortment 422052 Mainspring Tongue Ends

Swartchild & Co. No. 422052 Mainspring Tongue Ends, primarily unfinished for Swiss steel mainspring, in original envelopes that are in pretty good condition for the age. I expect each one of the ends likely exhibits some minor surface oxidation or rust but all appear to be perfectly usable with the proper preparation. Images do a suitable job of representing the item, although I think they are in better shape than the images might suggest.