Hebel RA ou BA

[GMCollection]

Hi,

I just acquired this Hebel, but I’m not familiar with the marking: RA ou BA. It’s an early model without a counter-screw and with a small serial number.
Do you have any idea what this marking means, or have you seen it before?

Thanks

Hebel RA m.jpg

Hebel RA.jpg

[GMCollection]

Hi,

Richard Anschütz, Melhis RA