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Its probably a marlin model 80,some were also made by winchester.
1958 to 1961
It is 25, the middle value when they are arranged in order.
45
The value of a 22 SLLR Sear Roebuck model 42-103.19791 depends on its condition. This gun in excellent condition is valued between 85.00 and 125.00 as of 2014.
A minus negative acts like a plus. -25-(-42)= -25+42 Different signs means find the difference of 17 and put the sign of the greater absolute value. So positive 17 is your answer.
41 or 42 ? about 350 $
100-1000 + depending on specifics.
Anywhere from 200 to 500 depending on condition