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Old August 11, 2009, 08:27 PM   #5
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Join Date: April 18, 2008
Location: N. Central Florida
Posts: 8,518

From that:

Rifles marked with only an indication of powder charge and bullet type as shown below date to 1912 or before:

2,67 g GBP
St m G

These marks show 2,67 grams of Gewehr Blättchen Pulver (military flake powder) and Stahl-mantel Geschoss (steel jacketed bullet). Other possible types are "K m G" for Kupfer-mantel Geschoss (copper jacket) and "Bl G" for Blei Geschoss (plain lead bullet).

After 1912 marks were changed to show just bullet type and bullet weight as in:
St m G
12 g

usually accompanied with a crown-over-N or the word Nitro, specifying smokeless powder.
Maybe that pentagon is a crown?
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