Your gun is right at the end of the time period (1961) were it could be worth a significant amount of money depending on what particular model it is. Do you know if it’s a 4 four screw version? If it is it would have 2 exposed screws on the lower right side plate with one concealed under the right grip and one in front of the trigger guard.
Looking in the most recent copy of the Blue Book of Gun Vaues based on the 4 inch barrel length and date of manufacture you mentioned it appears to be a 29-1. In 100% condition it lists at $4,500. At 95% it’s listed as $3,000. For 29’s (29-2’s) made in 1962 or thereafter value drops off significantly.
These stated values are based on a number of metrics (auctions/known private sales etc) to come up with the dollar value indicated. Like always, the gun is only worth what someone is willing to pay.[/QUOT
Only has "Mod-29" no other numbers or dashes