The 41st Gärtner auction contains two interesting Korean covers. Both covers are pre-1900 and contain stamps from both Korea (classical Korean/Empire period) and Japan. The auction is held on 16-17 August. For more information see the Auktionen Gärtner website.
These two covers are listed here “as is”, with the original text/graphics from Auktionen Gärtner:
Copyright images: Auktionen Gärtner.