Poland
Pre war roundels
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RWD-4 from pre-war aeroclubs. AL stands for Aeroklub Lwowski (Lviv’s Aeroclub).

Post war roundels
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Information based on book “Poland’s Captured Luftwaffe Warprizes (Polish Wings) (No.8)” by by Andrzej Morgala,‎ Wojciech Sankowski. During early post-war period gliders were marked in non-systematic way before official marking guidelines were made individual centres gave their ex-German glides Polish national markings of their own choosing, and those oblique ones were used for to overpaint German swastikas. Sometimes it was just a black square, red or red-white-red band and so on. Technically application of military markings on civilian gliders was illegal, but it still done during that period

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Poland Roundel tilted 45 degree. anyone pictures of this?

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edit: I found some and more information. See below!

The E-2 was acting as an agressor in an excersice. Painted with waterbased paint. US Navy aircraft

Finally the Tanzanian roundel

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