Forgive my ingorance, do you have background on this note? I am guessing it is some sort of WWII occupation note?
During the occupation of Japan and Germany, entry into the countries was tightly controlled by the military governments. Business travelers had to have permission of the military government. They stayed in approved hotels, rode approved taxis and trains and could only visit approved restaurants, etc.
In Japan business travelers were required to convert their money into Foreign Trade Payment Certificates which could only be used in the approved places. In Germany, the trade organization set up by the western governments was the Joint Export Import Agency (JEIA). JEIA Travelers Coupons denominated in Reichsmarks (pre-1948 Currency Reform) and Deutschemarks (post Currency Reform) were used.
I'm not really into collecting special currency serial numbers or things like that and did not even know I had this till another collector brought it my attention. I guess it what's called a "radar" number. The dealer I got it from a few years ago never mentioned it to me, in fact I don't think he even noticed it. It's different and nice but I did not pay any more for it than what a 1918 $ 1.00 FRBN is worth in the condition it's in. Bill Collector