Welcome to the Forum

Sorry for your loss

From the photographs there is not doubt that it has been fired.

That is known as the Model 27

I am guessing that if your husband had a shooting buddy you would have already talked with him.

A local gun shop, not a sporting store or pawn shop that sells guns, but a true gun shop would clean it up for you (obviously for a fee).

It is hard to make much more of a recommendation than that since we do not know what part city you are in. If you go and add your location into your profile I am sure that a Forum member in your area could make some better recommendations.

The serial number is actually N732448 and it dates back to late 1979 or early 1980.

The firearm is in nice shape and has many desirable features.

If the original box and grips were around, that would add to the value.