You will have to call Browning with the serial number.
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
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
Define 7mm. Do you mean 7mm Mauser ( a little less than 30-06), or 7mm Magnum, (a bit more than 30-06)
No, they are not interchangeable.
50-200 or so
yes
The 7MM is short for the caliber 7X57mm which is the 7x57mm Mauser Cartridge. When the Rolling Block was made in the late 1890's and early 1900's, the S.M stood for Spanish Mauser. The Spanish model 1893 mausers shot the 7x57mm round. the US was on the receiving end of that fine round in the Spanish-American war. At the time, the 7x57mm was known as the 7mm Spanish Mauser round.