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Based on martins excellent info above my time line fits 1860-80's

Not a wade and butcher like OP thinks, but a post civil war Sheffield for sure none the less.

What makes you so sure it's a W&B? Looks like a 'generic' 1860-80's 1/4 - maybe 1/2 hollow to me... Based in ur pics that is... By double hollow do you mean double stabilizer? I on my see one...