Here is another item from cup**** of x-bay.
This seller just sold a set of IJA Camo uniform: http://www.ebay.com/itm/121221966028...84.m1426.l2649
This time a what seems to be a IJA Tankers set.
WWII Japanese Army Tankers Uniform with Helmet Canteen Sleeve Patch Orig | eBay
The helmet is an obvious civil type. (The characters on the helmet looks freshly applied)
There are hand written characters on the inner tunic and helmet. (This time with a better hand writing.)
トラサン - Torasan (Probably a name)
第十タンク連隊 (Dai Jyuu Tannku Rentai) - 10th Tank Regiment