This is the description from the Standard Catalog of S&W 3rd Edition:
"Similar in appearance to the Model 41 without the fine blue finish or the extensive machining, most noticeable by square cuts rather than radiused corners. Also missing are a number of parts that are normally serrated on the Model 41. No muzzle brake or cocking indicator, red nylon grips. The slide/barrel assembly of this model can interchange with that of the Model 41 but not the reverse."
Here's a pic of mine. It has the 7" barrel with barrel weight and it's a late production piece from 1968.
Please post a pic of yours. They are quite scarce up here, and it would appear we possibly live somewhat close to each other.