Welcome from West Central, Illinois,
As a standard production, I don't believe you will find a 3 inch -1 gun however, nothing is cut and dried with Smith & Wesson.
I have found so many unicorns that even the experts say don't exist, But Smith & Wesson uses all their existing parts. And many time over run frames, barrels and cylinders etc. will be put up on the shelf and from time to time they clean up that overstock and special runs will be done with those parts for distributors etc. Or just put into a shipment. That is probably the main reason you see a lot of special runs that they made only 71 of.
My favorite Roy G Jinks quote is "With Smith and Wesson all things are possible"
Tom