Depends on (real) type and condition, condition, and condition.
I assume you mean a double derringer (model 95)?
Where did 1866 come from?
A type I model 1 couldn't have a serial that high. (and that's the only one made in 1866)
A type I model 2 doesn't have a serial no but a batch no
A type II model 3 may or may not have a serial based on which variation it is but that's starting in 1888.
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