"Generic European revolver" is about as close as we can come, at least without further information. As to value, those guns, in good condition and functional, sell for around $100, tops about $200.
I based my "English" comment on the shape of the grips and trigger guard, but the English didn't favor topless revolvers. (Page 3 is of course another story.)
The Spanish copied everything and many of the no-name guns in the catalogs and books are of Spanish origin.