9x23 ID

OK - this one has me stumped. I believe it is a 9x23 of some flavour…

992_9x23

The headstamp font looks very Spanish to me …9mm Largo
Doc AV

The headstamp pictured identifies this cartridge as a 9 x 23 mm Bergmann-Bayard, called “9 mm Largo” (9 mm Long) by the Spanish. It was made at Pirotecnia Sevilla.

John Moss

Thank you both. I just expanded my search to include PS and found a post that cleared up what I thought was a G (possibly a 6). I was reading the HS as G S 51, when I should have rotated it a little CCW, so it reads S 9 51. Seems so obvious now!