That looks to be in good shape for an 84yr old!
I'm familiar with Patridge sights, of course. All sorts of variations, just never seen one like that. Then again, I spent years learning about Smith & Wesson classic hand ejector revolvers. I should maybe have devoted more time to Colt things. Still don't know much about their revolvers...but it's never too late to learn, I hope...my primary interest being 1911s and all the variations thereof.The front sight is a Patridge sight. Looks like Partridge but with no r. I'll let other give the history on them. This OMT is a 38 special, I already have one in 22LR. I wish I could take credit for the pictures but they are taken by the seller.
Nice one. Depends on how well you like it as to what you're willing to pay.