Poland 1950 Poznan cover: Two Groszy ovpts - types 18 and 20 - nice franking

Description

This is a nice commercial cover mailed from Poznan to Warsaw.
It is franked with a pair of the 1950 5zt Reconstruction Issue (Scott #471) and a pair of the 25zt Beirut Issue of 1950 (Scott #482).
The stamps received two types of "groszy" overprints.
The Reconstruction stamps have a Michel Type 20 overprint and, interestingly, the ink color varies between the stamps.
The Beirut pair is canceled with Type 18.
Both overprint types are examples of less common varieties (see scans)
.
Although I checked "Returns Not Accepted" on the eBay form, I will of course accept returns if items are not as described
.