Reason For Certification By Sawczack-Knihinicki?

Do have another question. As I was sorting through my early bavarian stamps. I noticed several Porto Marken, inscribed: Vom Empfänger zahlbar. Of the ten I have, one has a stamp on the back and the name reads: Sawwczak-Knihinicki. I tried to find a difference in that stamp compared to the others and the only difference I noticed was a space between the letters h and l in Bezah lbar. Could this be a reason to have this stamp looked at and certified. Perhaps someone out there knows a better reason. Thanks....Peter

I don't think that's an expertizer's mark. Probably a collector's mark.

This stamp exists with 3 different watermarks, quite a spread in values. Also Michel indicates two lengths of the overprint (not in Scott) -- 16.5 mm and 17.5 mm. But I agree, it's much more likely a collector's or dealer's mark. The placement of an expertizer's mark (Prufordnung) was, and is, quite critical to the process. No big sprawling rubber stamps like this, as I recall.

Thanks so far, however, if you google his name, I found him to be an expert and quite well known specialist in certifying rare stamps. Thanks,,,,Pete

He's mentioned in this APS publication - http://www.postalmuseum.si.edu/Scho...es_20-30.pdf

From his biography, its sounds like he was an expert in stamps. I would bet this is his expertising mark.

Here is a biography in Polish:
http://www.zgpzf.pl/biography.php?id=60

Poorly translated:

SAWCZAK JAN-KNIHINICKI, b. 02/05/1896, d. 06/02/1973 in Torun. Degree in medicine. Activist Philatelic Club "Union". In 1936 he joined the Philatelic Society in Torun. After World War II took part in the relaunch of the Union, where he served as secretary. When the new branch of the Polish Philatelic Society was created in Torun, he was appointed secretary and from 1961-1970 president of the Management Department. Between 1950-1953 he was a member of the Peer Court Square, and from 1953-1969 a member of the Board of the PZF (Polish Philatelists Union). Delegate to the General Conventions of PZF from I to X (1951-1969). He was a specialist in classic stamps. His collections of Bosnia and Herzegovina, the English colonies, Ottoman Turkey, Prussia, have received high honors at exhibitions home and abroad. Made public his knowledge in specialized philatelic publications, such as: More on stamps dor#281;czeniowych (1961), Nowodruki Prussia (1961), Turkish Post Office in Bosnia and Herzegovina before 1878 (1971). In "Yearbook of Torun" published the story of philatelic movement. He was an excellent organizer of many exhibitions and events, such as the celebration of 40 years of philately in Torun, celebrations and inne.Za Copernican philatelic activity has been awarded the Gold Medal of Honour of PZF and the title of Honorary Member of PZF.