Check the date code on the Remington Society of America here: http://remingtonsociety.com/rsa/questions/barrelcodes
Your serial number indicates that your Marlin model 25 was made in the year 1973.
Your serial number indicates that your Glenfield model 25 was made in the year 1976.
With the serial number you have supplied,your Marlin model 25 was made in the year 1987.
Your Marlin model 25 was made in the year 1985,with the serial number that you have provided.
The Rolling block was made in 1907
Your Glenfield model 25 was made in the year 1988.
Your serial number dates your Glenfield model 25 to the year 1977.
With the serial number that you provided,your Marlin model 25 was produced in 1975.
A 25 hp Mercury, serial number OB283551, is a 1988 year model outboard.
I dont have a solid aswer. but I just paid $800.00 for 1 that is a little older.than that
Johnson and Evinrude outboards, use the model, rather than the serial number, to determine the year model.