I was looking at a 45 cal S&W revolver as part of an estate sale. Apart from the serial number (4 0r 5 digits I cannot exactly recall, and the caliber plus the Smith factory markings, there were no other identifying factors. Barrel about 6", the top strap did not have a target style sight rather it had a sight groove.
The cylinders were bored deep enough for the Long Colt type cartridge, and that was the ammo with the gun. Any idea as to what model it might be? An old Mod 25 variant perhaps?

that was my first thought when I read your post. An old model 25, but i don't recall them ever being offered with fixed sights. I could be wrong.

I think if you search Gunbroker, and the completed auctions maybe you can find one similar.

But hey, if the price is right, buy it anyway!!

Perhaps a S&W Hand Ejector? Might have started out life as a .455 caliber (for the British war effort) and converted to 45 LC?

Hand Ejectors in 45LC are scarce. A boatload were made for the British in the .455 caliber, and back in the 50's-60's a lot of them made it back here and coverted to 45LC.

Photos and a close inspection of the markings would help.

Should be a model 22. Here is a video of the remake in the Heritage Series.
https://www.youtube.com/watch?v=m55H6oR-D50

Yeah,I have one in 45 L.C. stamped with the lend/lease logo.Still shoots like a dream.

Try here:

http://smith-wessonforum.com/forum.php

Could be a "Triple lock: New Century:
http://www.milsurps.com/showthread.php?t=53177

MK II Hand Ejector:
http://americanhandgunner.com/...guns-of-wwii-part-6/

Or a 22 or 25 or 50

Yep,that's what I have.Pics helped.Thanks R.

Also picked up a 1926 model of a Colt New Service in .45 L.C. W/ factory pearl grips. Seems the sellers grandpa was the only one with any money during the depression + would'nt loan any but would buy guns.The kid wanted the money to buy an engagement ring.I asked him if he had a problem selling a family heirloom;he said no so I bought it in good conscience.