First first solo in about 13 hours in 1977. I had a spell of unsuitable weather, and was putting in dual waiting for the right conditions. It was a horrible day, gusty crosswind, and raining. I asked for the new plane in the fleet, thinking I would never go solo that day anyway. My instructor allowed me to take the new plane, then sent me solo in it. The plane was the very first Cessna 152 in Canada, C-GYVT, and had 33 hours total time since new when I first flew it, 18 of which would have been ferry time up from Wichita. Everyone wanted to try this new powerhouse with 108 hp, and getting it at all, out of a fleet of 20 150s was not likely. I was later told how much of a blast my instructor got from the CFI, for sending me first solo in the brand new plane in the fleet.
Second first solo was 30 years and 3 months later in my life in a Schweizer 300 CBi. I was a lot more nervous during my second first solo than my first!