Spanish (?) Rolling Block

I got this Remington made rolling block rifle yesterday, it has 1864 and 1866 patent dates on the tang but no other marking aside from what appears to be a witness mark on the top of the receiver and barrel. The 3 barrel bands, nose cap, and sling swivel are plated. My digital caliper says the bore is about .430 at the muzzle and about .518 at the breech. It came with a sword style bayonet almost 22 inches long marked Alex Coppel Soligen on the ricasso and on the guard 20B 7 on one side and 66043 on the other. The bayonet slides onto the lug and locks in place. No markings at all on the scabbard.
I am inclined to think that this is Spanish rolling block but the lack of military markings puzzles me a bit. What do I have here??

You should slug the chamber with cerrosafe or similar product, to confirm the caliber. It is most likely chambered in .43 spanish, but could be .43 reformado, .43 egyptian .... .43 spanish, was probably the most common military caliber. Except for rifles, from the middle east, I haven't seen military markings on most rifles. (I am in no way, an expert.) What condition is the bore? They are fun to shoot.
John

I believe your rolling block was manufactured by Remington. The reason is that the Spanish
made rolling blocks have a groove at the base of the breech block while the Remington is
with the groove, This is in the open position for loading