Wow. That's a beauty! Haven't seen any myself with smooth targets on one of this vintage. A rare treasure indeed.
salty, it means "Hand Ejector".
As to the gun, not much can be added. Surely one of the best of the pre-Models. Only thing better would be a 5".
Dave
Looks all scratched up to me.
But to be truthful it should have had several more passes for full coverage.
BR