In response to this thread on the AVA,http://www.network54.com/Forum/405945/thread/1308499712/Diana+27+with+a+twist
I have posted this response;
Here is my only Japanese marked Diana. (I'm always looking for other examples)
It has this series of kanji on the left side of the breech block.
Mine has a different Diana huntress to the three shown in Garvin's post. The rifle she is holding is like #2, but her sleeve is like #1.
The barrel has a brass liner, it appears to be smoothbore. It has a 5mm hole on the underside about 3 1/4 inches from the muzzle. The top of the barrel is stamped DIANA-LUFT-GEWEHR. The barrel is 36cm from muzzle to breech.
The cylinder measures approx 20.8cm from the front of the trigger block to the breech face. It has a Diana huntress logo above the word DIANA. No model number.
There is a small #62 stamped on the trigger block near the trigger (left side)
Trigger-guard is three hole.
Length from trigger to buttplate is approx 12 3/4 inches.
Comparing the kanji markings;
and mine has almost identical markings
These are read right to left and appear to mean something like Lug-system, Tax-free certificate. Mine has the additional kanji for Union.
If anyone has more information about the meanings of these markings and the time scale during which they were used, please share your knowledge.