The cylinder release looks somewhat Smith-ish...

...Ben
The cylinder release looks like it was hand checkered, like with a graver & hammer.
The left portion of the lines are over-run onto/into the edge of the solid area where the screw is positioned.
Did they hand checker them back then?
The bottom angle of the butt of the grips seems angled to the rear and downward in the pic. Maybe it's just that,,the pic. But it seems a bit more than I would expect to see. Isn't the bottom of the grip about parallel with the bore?
The hammer face appears cut way back to nearly the rivit hole for the firing pin.
You can see the white color of the 'tag' that is placed behind it in the photo.
Again maybe just the way the pic came out,,been fooled before!.
Is the Diamond around the grip screw a little large for a comon S&W produced grip panel?.
But just some things I see.
You can better see the hammer & cyl release checkering issue by enlarging the pics.
Can't make out the markings on the bbl,,maybe an '&' but that's all.
Could the revolver be a foreign product?