I just bought one, there worth a little less than $140
Your rifle was made for Montgomery Wards(western field) by Mossberg.The Mossberg model 320 is the same rifle.these single shot .22cal rifles are worth between 55-110 dollars.
10-115 USD or so
Made by Mossberg for Montgomery Wards during the 1960's and early 1970's. Were not required to have serial number until 1968, but many guns made for Wards were serialized before then for Wards' accounting purposes. sales@countrygunsmith.net