dual point distrubutor ??

I've got one but I just went out to my shop to find it & check numbers & had no luck. It figures, I was tripping over it for months so I guess I put it somewhere "safe". As far as I know, the 273 Hi Po motor & some 340's were the only small blocks that got the dual point. I know mine has a steel body instead of the aluminum I'm used to seeing Mopar distributors made of. Also seem to recall mine had a Prestolite tag on it. It uses a different cap (& maybe rotor) than other Mopar distributors. The vacuum advance unit had a hose nipple that would unscrew so that you could remove the spring. If I can find mine, I'll check it for a number.