Dan,
Now that you have made me feel really old, mine was on August 17, 1973 at North Conway NH in an "new" SGS 2-33 N1227S. She seemed really sleek next to the dodgy old 2-22 that was there (with it's pellet vario and cloth wing). I soloed N1227S 21 lessons later in October of that year. I never flew an airplane until many years later - when I learned because I was teaching power pilots to fly gliders and needed to understand their skill set. I think 27S is down in PA somewhere, still doing her job.
ROY