Pareidolia says the IJPO cancel on the 3s pair is CHEFOO with a really bad "E". Makes sense, anyway.
The comb cancel type with 3 stars at the bottom was used for telephone and telegraph purposes beginning with the Kiku/Chrysanthemum issue. It wasn't the only style used for that. So it more or less replaced the small double ring cancel we find on the Koban issues. However
, the 3 stars type was used postally during World War II. In Korea, Karafuto, Sapporo and some possessions since 1940, in Japan during 1943-45 except for military and seapost offices. The stars were also replaced by a prefecture name or equivalent character during that period. These wartime versions are probably going to be hard to find outside of Japan.
For the comb type, the only consistently postally used type is one with a time signature at the bottom, a combination of arabic numerals and a kanji character. Like this:
The leftmost character is "go" (p.m.) and the numbers are the time range in hours.
Collectors of used Japan all have partial strikes of various comb cancels, so the usage is indeterminate so long as the bottom section isn't present. But I think you'll find few purely postal cancels otherwise. A bit depressing to me, but there it is.