7,4 mm is the bore diameter. I wonder if it is some odd / rare Swedish round X 59mm? Have you a chamber depth or cast? Yeah, 10 gramme bullet and that looks to be the 4000 ATM(Atmosphärenpulver 4000) stamp coupled with the bullet mass. Pass thru the Zella-Mehlis proof facility in Okotber 1922 being #872 for the month. >>Made in Germany<< denotes it was for export to an English speakin' destination.

Ford will ferret it out....

Serbus,

Raimey
rse