FWIW, mine is #8103, 5mm. Neither the magazine nor the breech face will accept .25 ACP.
The gun is marked on the left side "Automatic Pistol Clement's Patent" and in a semi-circle above "Liege" the words "Charles P.H. Clement". There is a Chakra on the front (not the back) strap. There are no right side markings except the serial number on frame and bolt and the normal Liege proof marks.
The recoil spring is very strong and the pistol is quite hard to cock, even for a moderately strong man; it would be impossible for most women.