The 7mm is a smaller cartridge. If your rifle is not marked with the caliber, have it examined by a gunsmith. They may make a casting of the chamber using a material called Cerro-Safe. The casting is measured with a micrometer to determine exactly which cartridge it is chambered for.
No. Two entirely different cartridges.
50-200 or so
Yes.
rsi would say the value of the spanish mauser and bayonet value at 695.99 dollars
You will have to call Browning with the serial number.
No, they are not interchangeable.
Define 7mm. Do you mean 7mm Mauser ( a little less than 30-06), or 7mm Magnum, (a bit more than 30-06)
The serial number indicates a Model 1893 Spanish Mauser manufactured in 1921. Yes, it would be a 7mm with gas exhaust hole on left.
Bayonet; 10-50 USD
Based on a single source* the Model 1912 7mm Mauser, very similar to the German Rifle Model 98 was a standard issue for the Mexican Army in 1935. Mexico adopted the 7mm Mauser Model 93, in 1895, a similar rifle to the Spanish 7mm Mauser Model 1993. During the period of 1910-1920 many difference rifles were obtained, including the Japanese Tpe 38 rifle. In 1936, a Mauser of Mexican design was adopted. The design was a 7mm Model 1936 designed from the Model 98 Mauser with an external "cocking" mechanism like a Springfield Model 1903A1. *Ezell, E. C.(1977). Small Arms of the World. 11th Revised Edition, Stackpole Books, Harrisburg, PA 419-420 pp.
50-200 or so
$0 to over $1000. There's no way to be more specific without knowing what type of rifle it is. All we can determine is that it fires the 7mm Mauser cartridge. There are a lot of rifles - both military and civilian - which were designed to fire this cartridge.