Caliber can not be determined by serial number.
I have one and it is a 7x57 caliber is stamped on the left side of the barrel.
Oviedo's population is 224,005.
Oviedo was created in 761.
Gilberto Oviedo's birth name is Gilberto Oviedo Hernndez.
Pastor Oviedo's birth name is Pastor Jos Oviedo Rodrguez.
The address of the Oviedo Historical Society Inc is: Po Box 620841, Oviedo, FL 32762-0841
You can also get an inside caliper and measure the inside of the barrel. Bore should be .275 in. This is a Mexican Mauser - most of which were 7x57mm.
The address of the Oviedo Preservation Project Inc is: 6007 Lake Charm Cir, Oviedo, FL 32765-9576
University of Oviedo was created in 1574.
Leandro Oviedo's population is 327.
Fidencio Oviedo was born in 1987.