Sweep,

Metropolitan: Trade name used by the H. & D. Folsom Arms Company on firearms they made for the Siegal-Cooper Company of New York.

Apparently there was also a Metropolitan company that made handguns was well.

If it has damascus barrels, they may be from Belgium. See if you can find any makers marks or proof marks. If you do and can post pictures of them, some one may be able to identify the maker.

Pete