50-100 or so
$269 new retail price.
A Mossberg 22 rifle such as the Plinkster depending on the condition is worth around $150-200.
Blue Book of Gun Values
There are dozens of different models of the Mossberg 22 rifle. You did not tell us which model, and we need that to give you an answer. Sorry.
50-100 usd
Depends on WHICH .22 Mossberg, and it's condition. It may be as little as $25, or $250.
Made in 1976. Link at bottom of page to Mossberg .22 rifle info.
50-125 or so
IF the rifle has all sights, etc, has not had stock modified, there IS a modest collector's interest in the older Mossberg 22s. $200-$250 is an average price. They shoot VERY well.
There is none on the Mossberg 151M due to the date of manufacture
The mossberg model 151K was made from 1950-1951.