Hello, Stephane,
Leitz during the WW2, DID export Leica cameras,and Italy and Sweden (a neutral country in WW2) took delivery of Leica cameras from Germany.
It is known that new Leica IIIc cameras procured via Sweden were flown to England during the middle period of the war in the same Mosquito aircraft that was transporting ballbearings from Sweden, and were issued to the Royal Navy and these cameras were engraved with the Royal Navy marking "PATT 8665".A photography of one of these cameras is illustrated in "Leica- The First Fifty Years by G.Rogliatti" with typical engraving "PATT 8665" on Leica IIIc serial no. 374416 produced 1941/42.
Regards,William