Genuine NOS military grade UTC coil, 10Hy @ 0.066A (66 milliamps).  Dates to 1951! Real Golden-Age iron! You won't find new-old stock chokes for your Forties/Fifties tube amps like this very often. You will receive 6 transformer(s) inside original blue factory boxes, themselves wrapped in stock brown paper (with one partially peeled open, revealing blue inner box as seen). Note photos of an opened unit are illustrative examples only. 

The sample unit shown measured 11.27 henries as seen; DC resistance was 263 - probably a nominal 250-300 ohms. Mounting holes spacing is about 2" x 2-7/16". 

Auction lot of six sold at no reserve! high bid takes them all!