Mystery frame

I have a frame which is very puzzling:

- its has no stock lug but this area, while being a smooth curve, protrudes as far back as a frame with stock lug.

- safety area is blank but appears to have been milled slightly deeper on its entire surface. It does not show any trace of polished bright safety area (down position).

- safety slot is long and 1906 type

- it has grip safety features but block with safety spring and safety pivot hole is non standard compared to std 1906.

- it has horizontal C/N proof on left fwd frame rail above assembly lever.


I hope a few expert forum members can help me identify it.


Rgds,


Alain Capel