St. Petersburg with London proof marks on the flats. Not that unusual for other European gunmakers to "buy in" guns from the British trade in those days. Can't tell without more photos, but doll's head looks like maybe Webley A & W. The "19595" on the barrels is probably the trade maker's number, as it does not match the retailer's (no. 123).
The London marks on the flats are 1887-1896, and are both provisional and definitive. Not nitro. No "choke" markings. Seems odd. Are both barrels cylinder?
What's really strange is the absence of London's view marks which should be stamped on either side of the water table (both required view marks are present on the flats, but absent from the water table). Raw tubes alone were provisionally proved, but definitive proof required a barreled action in the white, and view marks were required to be stamped on both barrel flats and water table. All I can think of is that these barrels were on a different action when they went through proof.
More detailed photos would be helpful.
