Unfamiliar Overprint On Germany Of WWII

Can anyone provide info about these stamps? Haven't been able to find the overprint in Scott, Michel or Yvert-Tellier.

These look like very common stamps with modern fake overprints and very likely fake fieldpost and Graz cancels.

Makes sense, inasmuch as Michel's Deutschland-Spezial catalogue doesn't mention them. Also the cancellations are suspiciously similar on each.

Emaxim, there would really be no reason for these overprints. When Austria was absorbed into Germany in 1938, Graz became a German city.

The Hitler heads were issued a few years later.

Many similar items have appeared in the last few years. The unscrupulous creators and sellers have been busy.

Bizarrely done fakes, given that the Hitler head overprints were done after the fall of the Nazi regime. These ones have the swastika as part of the overprint - hardly an effective way to "de-nazify" the stamps...

Further SCF Reading,
https://goscf.com/t/52307

I had thought—without facts or a shred of evidence—that, in its retreat from the Eastern Front, the German army might have established separate Feldposten along the way. Or that local Nazis might have applied these overprints as a statement of loyalty as the roof fell in on them. But then, in either case, Michel would have said as much. Does anyone know when these fakes began to appear on the market?