See related link.
Check the Remington Society of America, date barrel codes and location. http://remingtonsociety.com/rsa/questions/barrelcodes
Perfect condition, 28" BBl with Rem chokes, $350.00. Short rifle sighted slug BBl with no chokes $290.
To determine the age of a Remington Model 870 Wingmaster 12 gauge with a 3-inch chamber, you need the serial number, as Remington's serial numbering system can help identify the year of manufacture. Generally, you can find resources online or consult Remington's customer service for serial number lookup. Without the specific serial number, it's impossible to determine the exact age of the shotgun.
http://remingtonsociety.com/rsa/questions/barrelcodes
150-225 USD They have the internals of a Wingmaster. Fit and finish of the working parts puts them FAR ahead of any Express. They are as smooth as any Wingmaster. The exterior receiver is not polished as well as a Wingmaster, and the wood is cheaper. This was Remington's first attempt at producing an 870 to a lower price point, and unfortunately didn't create as much profit as the rough-as-a-cob Express.
D081337n
$200-$250 if better that 90%.
$139.95
I just purchased the same gun manufactured in 1971 with the 28" 2 3/4" and 30" 3" barrels in 95% condition for $276.50
100-400 USD
$200
$75 to $250 depending on condition. Express do not get the value of the wingmasters.