Przedborz is a lot of fun. Completely philatelic, yet replete with varieties, types & forgeries. The Ginsburg site is wonderful, if a bit daunting to the average collector (as are the stamps)
Here's my quick guide to instantly tell whether you have a genuine or forged Mi 1 or 2, the characteristics are the same for both. This involves the left wing (looking at the stamp). Check out the left side of the bottom row of scales.
1)
GENUINE if there is an oblong dot
FIRMLY attached to the edge of the wing.
2)
FORGERY if there is
NO dot
3)
FORGERY if there is a dot but it is
NOT attached to the edge of the wing.
There are sub-types of the no-dot variety, & you should go to Ginsburg's site to determine which one you have.
Here's the illustrations showing 1 to 3, left to right.

Here's my copies showing 1 to 3, left to right.


A couple of my proofs of these stamps
