Remington Society barrel code lookup: http://remingtonsociety.com/rsa/questions/barrelcodes
They have date code stamps on the barrel which can be looked up on the manufacture date link on the Remington Society of America. --- Update: It's important to note that the barrel on the shotgun MAY not be the barrel that was originally on the shotgun at purchase. Check the serial number with Remington.
100-350 USD
Contact Remington Customer Service through their website.
Made by the Remigton Firearms Company.
The W ahead of the serial number indicates that your Remington 870 wingmaster was made in 1972.
your Remington model 1894 shotgun was made in 1899.
They are all still made in Illion, New York, I believe.
Check this table for the answer: http://www.remingtonsociety.com/rsa/questions/barrelcodes
To determine the exact value of a Remington Wingmaster 20 gauge model 870, a few different things would need to be taken into consideration. Some of these things would be the age and condition.
Go to the Remington Society of America and click the Manufactured link, it has the location and barrel codes for month/year of manufacture.
Look at the date code stamp on the barrel, see related link.