It's tough to tell by looking, but easy enough to test. Get some nail polish remover (or acetone if you have it around already) and put a drop on the heel. If it eats the finish off, it's nitro. If not, it's poly.
Also, because it's tough to tell it's even finished, Warmoth puts a "dot" sticker on the heel of satin nitro finishes. See the red dot?
I'm not sure how long they've been doing that, though.
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