Yes, OS #762. I believe I have a couple of those in the shop, NIP, if anybody wants to buy them. The tailpipe is silly small. Can't say I've ever seen anybody use one, except Pete Peterson. His look a lot like yours, with no tailpipe, no fins, as light as possible, big hole where the tailpipe was. Very shiny! But he used them on Fox .35 Stunts and still uses them on DS .40's.
The Foxes all "blowed up", from 11,000+ launch rpm on his VERY competitive "Jamison's Favorite" aka "Special". The DS .40 runs exactly the same, same prop, 10.5 x 4.5 APC. It's muy noisy, with either engine! Except that the Foxes don't make noise anymore because the cranks all broke, including the Zoot one. Pete swore off Foxes. We're all to old to start a Fox .35 Hurling event.
Steve