What is this headstamp?
A version of the Sellier & Bellot head stamp, IIRC.
Vlim - you are recalling correctly. It is Sellier and Bellot - a rather odd rendiition of their headstamps, historically speaking. I don’t know what they did it - probably a contract that called for that headstamp.
Contract for Austria. Reportedly they had already bought 9mmP from Spain with the “SB” headstamp code so required S&B to use the “SAB” code.
Lew - why did I know that you would have the answer? :-)