Hello, new member here.
Interesting that the first thing I read here should be so familiar to me.
Currently my only Parabellum is a shooter grade "mostly matching" m/23 that has been converted to 9mm using a Tikkakoski barrel.
For what it's worth, here's a pic of the Tikkakoski stamp. Didn't know the longer barrels are more common, mine is 10cm/4".
Mine doesn't have any SA stamps either so no telling when it has been converted. Shoots very well, though. I'm looking for a more collectible 7,65 one to go with it...