Identification Of Cover From 1927

hey folks
i wish some help for information about that cover
my question is that cover fly from china to germany ?
or from Hanoi (Vietnam) to germany ?
Thank you in advance

What the instructions say is: airmail to Hanoi, transfer to Air France flight (from Hanoi, in a French Colony) to Paris, and then to Berlin.

THANK YOU NSK
but what not understood to me is the addresse wroten in back :
Starke Hotel de commerce yuennanfou China . is it originally addresse of expiding ?

That's the address of the sender.

And it appears to be missing 2 stamps.

Are you sure you are reading the date correctly? Air France was created on October 7, 1933. It did not exist in 1928. If the routing notation is a miswording and does not actually mean THE Air France and means only to go by some kind of French flown airmail, then it still is a bit confusing since so far as I know - and I admit I am not an expert on Indochina aviation - the first flight of a French airmail from Indochina to France was in 1929. I would be happy to hear from an Indochina expert on whether there was any earlier airmail by any French aircraft from Indochina to France in 1928. Perhaps there was? The other odd thing about this cover is that the envelop that was used is a typical British one rather than a French one. Perhaps the sender was British and was just using stationery they happened to have handy?

As Kimo states, Air France did not operate under that name in 1927.

The manuscript on the front also raises a question.
The cancellation is for 13.7.27 (German office in China?).
The manuscript appears to read 23.7.38, which would be the correct way, in German, to date something at 23-7-38.

Could the cancellation have had an incorrect year slug?
Or has some text been added at a later time?

Is the 'by airmail' label correct for the time?

The postmark on the stamps are in the chinese calendar dates. Year 27 converts to 38. Founding of the Republic of China 1911 (year 1)...

Well now it make sense , thank you all for the valuable informations
it seems that beautiful piece even damaged (Missing 2 Stamps )