What does the stamp GK mean on jewelry?

Who made Charles daly 45 saa? What is a belgium browning 270 semi automatic worth? Where can I buy parts for the Rossi Puma 92 originally imported into the US by Interarms? How much does a loaded beretta 92f weight? What firearms manufacturer produced the New Keystone 12 gauge shotgun serial number 2931 and what is the date of manufacture? Is 22-250 good for hunting deer? Where can you locate stripping marks on fired bullet? What is the history and value of a Berkshire double barrel shotgun with Serial No S8252512? What year was a Sig P220 serial g 302699 made? Where do you buy a C02 cartridge for a Crosman 160 pellgun? Who manufactured western field model M989 22? Where is the serial number on your marlin 336? When was model 94 serial number 1029608 made? What is a fairly new marlin 22 model 880ss worth? How much is a Winchester 30 30 model 94 AE gun worth in excellent condition? How can you identify a 22 caliber Ranger pump action rifle marked 22 SL LR on the barrel? How old is my Winchester model 94 with serial no 650002? What is the age of a 12 gauge Springfield Model 67B pump serial A691347? What is the smallest 40 caliber? When was a J Stevens model 235 exposed hammers 12 gauge serial66032 made and what do they sell for?