Picked up a Spanish bayonet this morning that has a leather scabbard. It is pliant and flexible but feels a bit on the dry side. The blade was coated with cosmolineicon so I'm assuming this is present on the inside at least.

The last leather I treated in any way was an old baseball mitt and that was so long ago I don't remember what I used. I'd like to preserve the leather so it doesn't crack.

Any suggestions?
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