Ah, if just forget of misread your text.


The Crown over G(Geschoß-Solid Projectile) denotes the tube was proofed with a solid projectile


Crown over S(Schrot) denotes the tube was proofed with Shot.

Crown over U means it was inspected.

The Imperial Eagles coupled with the G or S note the preliminary proof effort & charge as well as 2nd pass & charge.

The K in a jagged circle or ratchet is the mark of the barrel maker & it is either a Kelber or Klett(Acorn Folk).

Serbus,

Raimey
rse