Hello Lauri
it's a big puzzle! It has some details that makes it look more close to the HJ bluse, but the buttons are different. However, in the period pictures in Japan the buttons were silver. The lining is similar to the DAF one and also the buttons, but the wrist band is different and mine has not been shortened for sure.
No markings on mine as well.
With regards to the sketch, it looks like my jacket, with the only difference of the ramps, mine has 5 and both the leader and DAF have 6...
The one from Weitze has different pocket design but 5 ramps...the one from another collection looks like mine but different lining