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BLue Book of Gun values is a place to start
Sounds like a Browning Model 1900. SGDG is means "Patented, without guarantee of the government" Try this website: http://www.gunsworld.com/world/browng1910_us.html
The pistol is actually a Model of 1900 made by Fabrique Nationale (FN) and designed by Browning. These were used extensively during WWI by trench sweepers and Belgian/French officers. Modern repro magazines for them are available from gun parts sources (try numrich online). Good luck. FYI, Brevete means "patent" and SGDG stands for "Sans Guarantee Du Government," which means without the guarantee of the government. The name of the gun is FN Model 1900 or Browning "Old Model."
Up to 500 USD
No published sn data.
It will depend on the condition of coarse, but if you were to sell your FN .22 Model E 1912 (Brevete SGDG is just the word Patent and SGDG the conditions that apply to it) for parts you might fetch about US$150. A rifle in good conditon will fetch upwards from $250. If you want to parts it I'll take the bolt off your hands. Mine is missing this vital ingredient.
bte = patented (brevette) SGDG = sans garanti du guovernement
Cant id the model based on this. Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Recommend taking it to a gun shop for appraisal.
No known sn data published.
"Bte S.G.D.G." is an abbreviation for a typical phrase concerning products from France. "Bte" is short for "breveté" (="patented") and " S.G.D.G." stands for "Sans Garantie Du Gouvernement" (="without government guarantee")