Armstrong Dual Range sight sight information

[AbitNutz]

I have a nice receiver sight that looks like the usual Redding, Lyman, or Parker Hale sight or perhaps the 1920s or 30s. They're uncommon but not unheard of. I've seen them pop up on eBay every now and then. It has a neat trick where you flip a small lever and it changes the range by a predetermined amount. It's very well made but the only marking on it is "Armstrong". I have been unable to find out any information about the company that made this sight. It might be English it might be U.S.-made.
If anyone has some information on these sights or this company I would be very happy to hear about it.

 

[ZG47A]

Type in Armstrong Dual Range Sightmaster. Apparently a post WW2 product. Cannot tell you any more than that.

 

[AbitNutz]

I sure wish I knew what country it was made in.

 

[roostercogburn98]

Pics would help your search

 

[AbitNutz]

 

[AbitNutz]

The sight on the far right is the one I have. You can see the oblong lever coming off the top. If you flip that it changes the height a set amount.

 

[AbitNutz]

Here's another view on a Mauser rifle