As with any firearm, it is not possible to accurately appraise a gun without seeing it. Condition, and original configuration will determine value. Other factors such as rarity of caliber or guage and higher grades have significant impact on value. Recommend that you see a local gun dealer for an appraisal. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
50-200
A 20 guage WInchester 37A youth model will go for between $100-150 USD depending on condition.
I have one that was purchased new for me in about 1971/72.The Winchester model 370 Youth shotgun was produced from 1968-1973.
$200 in very good condition
I think it is worth upwards to $500
I see these selling at www.gunbroker.com for around $150 if it is in good condition.
$125-$200 depending on condition. sales@countrygunsmith.net
Around $150 in excellent condition. sales@countrygunsmith.net
Very little, maybe $100 if nere perfect.
100-500 USD
Model 37A Single Barrel Low $55.00 High $140.00 Model 37 Youth Low $40.00 High $175.00
I purchased one new in 1960 or 61