Re: A personal or unit emblem on aircraft?
As shown in the PZL P24F photo, this was the Bulgarian Air Force roundel from 1937 until 1941. It is also the symbol; of the Bulgarian Medal of Bravery. I believe the photos that you show are FW44s flown by Bulgarians, hence the symbol. Much like allied nations put their air force's roundel on British Spits and Hurris.
Vic
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