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Even if it is, it's still not much of a concern. Only a very old strop would use natural stitchings, and even then, the risk is minimal on an item that is used and cleaned regularly.

Also, you...

I can answer that one. This is probably not true anymore, but a very long time ago, up through the 50's or 60's a lot of oils and greases that were sold for leather were made from animal fats. i.e....