Welcome to the forums from the Wiregrass! S&W did not have model numbers when that gun was made. They used names to ID the model. That gun is, as has been stated, and was sold as the New Model Number 3 Frontier and all were chambered in .44-40 AKA the .44 Winchester Cartridge. It is an antique and can be mailed or shipped by common carrier directly to a buyer. If you mail it, you will have to register your FFL with the post office and probably put a copy of your FFL in the shipment. They have some new form you place on file. This is a Post Office requirement, not ATF since they consider it an antique.

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Guy
SWHF #474 SWCA LM#2629