how much is it wothfold down model
100 or so
It was made from 1950 to 1957. If you are interested in the older Mossberg firearms, get a copy of "Mossberg-More Gun for the Money" by Victor Havlin.
Depending on condition, anywhere from $50 to $200 for a 152 in new-in-box condition.
Your rifle is a Mossberg Model 353, built for Western Auto hardware stores under their Revelation brand. This is an updated version of the Mossberg Model 152, and was made from 1972-1985, Value is $125-$200, based on condition.
50-100 or so
A history of Mossberg has been written and is available on Amazon
If you want to see SOME of the MANY 22 semiautomatic rifles that were made by Mossberg, go to google, at the top of the screen select "image", and then type mossberg 152. If you are looking for an image of a particular Mossberg 22, you need to type in THAT model number. There are more than a dozen different models.
50-125
There IS no serial number. The Mdl 152 was made from 1968-1957. Serial numbers were not required on rifles and shotguns until the advent of the 1968 Gun Control Act. Does not have one, is not required to have one.
Made from 1948-1957. There is a separate model 152K. Depending on condition and completeness (often missing magazines and rear sights) these are worth about $159-$250. They were made before serial numbers were required on rifles, and so have no serial number (yes, it is legal). Some parts are available from Havlin Sales and Numrich. Link at the bottom of this page to Mossberg .22 rifle model info. Enjoy- they are fun shooters.
Not sure what your question is. These are the successor to the Mossberg 152 rifles made in the '40s. The 352 K was made from 1957-59, value is about $150, depending on condition. The fold down forearm makes for a very steady hunting rifle. Parts are available from several sources, including havlinsales.com, and gunpartscorp.com.