By the serial number If it ends in T OR S it is an older gun, probably for the 60's or 70's. Also, if it has a black mag flap on the underside it is a newer gun. The older ones have a chrome one.
Contact Remington Customer Service through their website.
Remington did not make a "Wingmaster" shotgun in 1936. The Remington Wingmaster (Model 870) was first introduced in 1950. remingtonwingmaster.com
It's date stamped see related links for info.
Is it a Wingmaster or an Express? Can't be both.
Yes
There is no such model.
Remington made the 870 Wingmaster
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.
$2
the express is the cheaper model Remington came out with. There are many more models like the tactical ones and the wingmaster. The wingmaster is one of the better quality models.
Depending on the buyer... $275-$375
remington wingmaster 16 gauge