Czechoslovakia 1.20k President Masaryk Unusual Green Postmark

This is a Czechoslovakia 1.20k President Masaryk carmine rose definitive issued in 1945 (Scott 295). The stamp has been canceled by an unusual green postmark.



The stamp has gum and paper adhering to the back, so it may be a CTO that got stuck to somebody's album page, or it could be a postally used example. The postmark is cleanly struck in green with the year "1945" and the post office ("STO...") partially visible.

Here's what I find unusual about the postmark:
1. Applied in green, rather than the usual black;
2. Very cleanly struck with no smudging;
3. The date starts with the year. I'm used to seeing European postmark dates in the form "10.VI.45", for example;
4. A clean break in the outer ring at the 7 o'clock position.

I'm thinking this is a philatelic creation, but I really don't know.

Has anyone seen a similar postmark on Czechoslovakia stamps of this period and can provide more information?

All responses will be greatly appreciated.

Regards, Robert

That's a provisional postmark used after WW2. Can be found in range of different colors (shades of blue being most common). All in all not the most common thing to come by, but not rare neither.

I showed a similar item (in different color) on my stamp blog http://www.stampcollectingblog.com/...postmark.php several years ago.

-k-

Excellent. Thank you.

Robert

How much are worth that provisional postmarks? For example orange provisional on imperf. Hlinka 20h stamp?