Sight ID --help needed--

[jpc]

Identification of this sight is appreciated
I do not have the base

thank you
jpc

View attachment 447637View attachment 447638

 

[green]

US M1905 sight sighted for M1906 ctg for M1903 Springfield.

 

[jpc]

Thanks again ☺

 

[Mk VII]

Appears to be a WW2 replacement, without the 2850yd notch on the top of the leaf.