The item offered on eBay is NOT a Medical Suspender - the straps very much look like suspenders from the M-1928 Haversack, or something similar ...
I'm afraid the only genuine Medical Suspender is the item described in our Article TR No. 405-95 . For more data , please revert to my Article relating to Medical Kits & Contents - Background Information and Development . I still think this is the only available information on the subject . Medical suspenders and lots of other MD accessories never carried any specific manufacturer markings (with the exception of individual , and possibly unit markings) .
Another friendly advice , please don't take ALL data in H-P Enjames' Collector's Guide for granted !
Alain S. Batens