870 LW MAGNUM in 20 gauge

[coasthunterjay]

on my 16th birthday in 1999 my grandfather gave me a green rectangle box that had a gorgeous flawless glossy finished 20 Gauge "870 LW MAGNUM" in it. to this day i use it for my primary bird gun. But dont worry it is still flawless. If you ever looked at it you would think i just pulled it out of the box. the question is all i can find out is that it was manufactured in 1972 the other catch is that the barrel that came with it has interchangable chokes and i was under the inpression that those shotguns didnt have interchangable chokes untill the mid 1980's i think 86 to be exact. the serial number starts with a (W) but ends in a (U) Can someone please clarify on the date of manufacture. Another question is i dont know if it is an express or a wingmaster, how can you tell? and perhaps please tell what the shotgun is worth? it is worth alot to me but street value. Thank you to RSA..............................AJ