Check the Remington Society of America, date barrel codes and location.
http://remingtonsociety.com/rsa/questions/barrelcodes
See related link.
Serial 718943w
The Remington Wingmaster with the serial number 2039814 was manufactured in 1980. Remington's serial number system can help date their shotguns, and this particular number falls within the range indicating production during that year.
100-350 USD
http://remingtonsociety.com/rsa/questions/barrelcodes
Made by the Remigton Firearms Company.
Contact Remington Customer Service thru their website.
Perfect condition, 28" BBl with Rem chokes, $350.00. Short rifle sighted slug BBl with no chokes $290.
The W ahead of the serial number indicates that your Remington 870 wingmaster was made in 1972.
http://remingtonsociety.com/rsa/questions/barrelcodes
Check this table for the answer: http://www.remingtonsociety.com/rsa/questions/barrelcodes
It's date stamped see related links for info.