No published sn data.I can say that the Mossberg model 151 semi-auto .22cal rifle was made from 1950-1951 if it is the model 151K.The model 151M was made from 1946-1947.The model 151M(a),151m(b),and 151(c) were made from 1947-1958 and were close to the model 151M with minor changes in the buttplate,and sights.
The Mossberg Model 151-K was made for two years only: 1950 and 1951.
This semi-auto rifle was made between 1946-1951.
Depending on condition, between $100 and $200.
Check the Blue Book of Gun Values
47-58
The Mossberg 800 series was made between the early sixties to late seventies.
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.
Do not attempt to use other than a Mossberg bolt made for that rifle.
A Mossberg 22 rifle such as the Plinkster depending on the condition is worth around $150-200.
It is the rifling in a mossberg rifle barrel.
Your rifle was made for Montgomery Ward stores by Mossberg, and is a Mossberg 346K. You can check with a gunsmith, or check the website for gunpartscorp (look under Mossberg). Havlinsales also stocks many Mossberg parts.
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.