Crosman Rear sight for Colt Campion 1911

Hi all,

I inherited a Colt Government .177 air pistol, model U-1911NC from a friend. On the box it appears it was manufactured by Umarex/Crosman.

It’s missing the factory rear sight. I’d like to get a factory sight or an adjustable sight if available. I’m not interested in putting a red dot or scope in it, I prefer iron sights.

While challenging, It’s not nearly as much fun shooting without a rear sight… LOL

Thanks in advance for any help!

Art.
 
Here's a few pictures of what the rear sight dovetail looks like. Thank you for the help!
Colt Air 1.JPG
Colt Air 2.JPG
Colt Air 3.jpg