Sven, Youre right on the money.... That "T-Mark" symbol is just to the right of the "produced in Japan" statement...So this means some sort of testing facility decided to declare this thing as safe for 15A??? & yes, the male cord cap is held together with a nut & screw [Linked Image] This ones about a foot long.. I've actually had this thing for some time.. (At least 1996), Kinda funny, I found this on a call when I lived not too far from you. (Massapequa, LI, NY) It survived the trip back to California & has been with all my antique "don't use" stuff in the garage ever since.. I really don't have a clue how old this thing might be... I'm guessing somewheres in the 50's or 60's judging by the lack of polarity control, lack of markings on the power cord & writing style...

-Randy