Probably a Mac 25
Tim, I believe the boat you saw was a 25. Although the 25 was made from '74 to '87, until '80 they were called Venture with an "F" hull designation. The MacGregor 25, from '80 to '87 has an "R" designation. The first 26 ("W" in HIN) wasn't built until the '87 (model year).The other give-away was the lead in the centerboard (often called a swing keel on the 25 because it actually provided significant righting moment like a fin keel). The 25 Centerboard weighs about 625LB and requires a winch to raise it. On the other hand, the 26 is water ballasted and the light centerboard can be lifted by hand.All MacGregors/Ventures with the weighted swing keel (including the '73 Venture 17 I owned) eventually have water leakage into the centerboard fiberglass shell. Once water attacks the steel post that supports the lead ballast, the fiberglass can no longer adhere to the rust. The fiberglass cracks and starts to fall away. Someone on this site should know where you can get a replacement swing keel or tell you how to rebuild the old one.The Mac 25 is lighter than the 26C when ballasted but can carry almost the same sail area making it a good bit faster (results may vary depending on skipper).The Mac 25 was the one inducted into the American Sailboat Hall of Fame Museum. (see Related link below)Happy sails *_/),MArk