This is a 637 Air Weight, one of four I did up for my wife, daughter and grand daughters to get their CWPs. The Air Weight is very light, a 2" 38 Spl +p, hammer gun, not the hammerless.
The hammer spur on these guns is rough stamped steel, it rides inside the hammer coil spring and needs to be removed and polished on all four sides. The springs can be changed out if you wish. The pictured gun has Packmeyer grips to give one more finger on the grip. With 125 JHPs it makes a decent pocket pistol. They all got their CWPs.
My wife a licensed PI from Memphis, carried a 60 for years, she loves the Air Weight 38.

[Linked Image from i.postimg.cc]

“To expect defeat is nine-tenths of defeat itself. It becomes a self-fulfilling prophecy. It is best to plan for all eventualities then believe in success, and only cross the failure bridge if you come to it."
Francis Marion - The Swamp Fox