Can Anyone Tell Me What Kind Of Error This Is?

I need help identifying the type of error on the back of this Belgium 1944 SC# B385 Sons of Aymon Astride R stamp.

It is not an error. When printed the still wet sheet was deposited on another sheet, hence the reversed image



Peter

Or more likely, in my opinion, is that this stamp was stored on top of another version of the same stamp. During storage, there was some extreme heat and a minor amount of pressure pushing the two stamps onto one another. (A environmental issue, probably not deliberate.). Then a previous owner found them stuck together and pulled them apart. The stamp that was on the bottom probably was so damaged, it was tossed away long ago.

I agree with Partime. The shift does favour stamps being stacked, rather than a sheet being wet and then stacked incorrectly.

Oh! Yeah, okay, I see it now. Well, thanks guys. :)