Mossberg Model 340.
1960 through 1968.
100-340 or so
$50 - 150 depending on the condition......keep it.
The Western field model M820B was made by Mossberg for Montgomery Wards.The Mossberg model 340 is the same firearm that you have.these were made between the years 1958-1980 by Mossberg.
100-340 USD or so
savage arms
50-340 USD or so
about 340 milli About 340 milli
The model 340 was made between 1969-1989. In very good condition it is worth between $85 and $100
they are worth $340 each
No published sn data.