I would be interested in this info, too.

I have the 950 base issue, the 1050 (as you pictured), and a 1050 with the additional G.O. overprint. If its of any help, all 3 of mine look to be the same base stamp, and my 1050's have the same typeface on the surcharge/overprinting as the one you have shown.
I'm a newb, so I may be missing a fine detail between my own 3 examples.

Login to Like
this post

Angore.

Response much appreciated.

Will look into obtaining Ngo catalog.

Cheers.

Jim.

Login to Like
this post