I have a 1970 Irwin 38 aft cockpit sloop. Rigged a bit differently than the spec. sheet Gene Gannon has posted at Irwin.com, I figured these were mostly from production difference/options and 36 yrs. of owner mods, But this style Irwin seems to be pretty rare. I've only heard of 3, 1 for sale in Florida states it's one of 6 Ted Irwin built for the Mackinac race, it seems equiped very similar to mine, the traveler runs across the center of the cockpit, while the spec sheet shows cabin top mount. the boom seems to be an early roller furling boom where the whole boom rotates.the gooseneck is mounted on a track instead of welded and the engine runs thru a V drive instead of straight. the boat for sale on "Yachtworld" in Fla. has all these same variations from the spec. sheet as mine, but the original owner died,so no info. If anyone knows about any such special racers, please let me know. Thanks, Art.