Hallo Sylvain,
at first: Munich - Aschau am Inn is an inner-bavarian destination. The first one of the (bavarian) half-circles on the backside is from Endorf (today Bad Endorf) which the letter passed on it`s way from Munich still on the same day when it was dispatched (31.10.). The second one (01.11) is from Kraiburg (Oberbayern). The target-location Aschau (Oberbayern) was dedicated to the delivery-area of the post-expedition Kraiburg.
Best regrads !
Tim