The brown one is simply marked Japan....can't tell for sure but it's likely about 1950.
The other is a mystery to me....no idea about that mark nor the style of the pot.
Linda C

LindaC: If it were 1950 wouldn't it say "Occupied Japan". In 1921 they were obligated to identify the country of origin in Western words, i.e., Japan, not Nippon. I'm guessing (and really, just guessing), 1921 - 1940. I have to say, I do get confounded by Japanese backstamps!
Annie

Ok....so make that 1951....when the Occupation ended.
My opinion was based on the style.
Also know that nothing is absolute...there were things brought back by tourists not marked in a way for export.
It also could be earlier....but not likely later. It's sort of a non traditional shaped brown Betty.
Linda C

1952 ended the Occupation. Nope, I'm guessing earlier. But just a guess.