it is below the feildmaster logo
OH on the barrel? that's not the serial. If it's early probably July 1961.
Check the barrel codes on the Remington Society of America. http://remingtonsociety.com/rsa/questions/barrelcodes
50-150 usd
Request an owner's manual from Remington on their web site, it's free.
50-150 USD or so
You need to look up the barrel codes, the details are on the Remington Society of America here: http://remingtonsociety.com/rsa/questions/barrelcodes
You can request an owner's manual for free at Remington's web site. 10
All Remingtons made from 1921 have a date code stamped on the barrel. The details and table can be found on the Remington Society of America, Manufactures Link.
go to Remington web site they can help you as they did with my 870 wingmaster
The link gives barrel code location and tables to look up date.
It's date code stamped on the barrel, see related links for information on the Remington Society of America.