Thanks all.
1956, pretty neat.
I wasn't sure what year the model 10 designation was attached to these, I think it's cool though that it's a pre-model 10. Thanks for the info.
As to the +P ammo- I'll put a cylinder full through just to check poa/poi, and after that it'll probably only see target loads.
I did know the grips weren't original, and I'm not real fond of the plastic feel, but I kind of like the color. Might look into some bone or antler grips, but probably just stick to wood.
The writing on the inside of the grip is backwards- looks like whoever made the mold forgot to compensate. Reading right to left it says "FITWELL BY MARWYN" though the A looks like an H with a line connecting the tops of the uprights.
It is in very nice shape. There is bluing wear at the muzzle, as well as many of the edges and high points. The ejector rod is probably the roughest part on the gun and even it just has a bit of patina developing.
Not bad considering that I got it and 100rds of Winchester 130gr FMJ's for $280.
I love the weight and balance of this gun. I'm a terrible judge of light weights, but it really doesn't feel that much heavier than my 642.
I'm rather looking forward to my next range trip.