Odd Chinese 7.65 H/S

This headstamp is on a 7.65x17 Rimless Chinese round I recently got. Can anyone explain the purpose or meaning of the fairly deep overstamp/marking just before the 311?

Jon, can you see a series of slight flutes along the case body?

Could it be an ejector mark?

Ejector Pin marking from Auto Pistol (Browning, I think, M1900 or M1910?)

Doc AV

Jon, I’m intrigued, did you check the case?

Sorry! No noticeable flutes.

Jon, thanks, then it was fired in a Type 77 pistol, which left the same ejector marks as the Type 64 but has a different chamber configuration.

Thanks.