Rolling Block ID

[Anzac15]

Just picked this dirty, but complete Remington rolling block up at a local pawn shop. Mechanically tight, with surprisingly good bore (again, dirty) should be a good shooter.
Having trouble nailing down the model. Don't know the caliber yet. Has an interesting rear sight, looks like a peep.
Got it apart, going to give it a good cleaning.
Appreciate any thoughts!

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