Posted by Alec W. (2.25.175.167) on September 05, 2022 at 14:34:11:
In Reply to: Kabuki envelop posted by Serge A. on September 04, 2022 at 16:59:30:
I read the seal as "Konobu" 小信. I take this to be the work of Hasegawa Sadanobu III, aka Konobu III. A quick search turns up some interesting examples of Sadanobu III designs printed on envelopes, such as this retail listing:
https://www.bakumatsuya.com/shop-description.php?ID=1627429705&La=E
-A