Series 1811,
I'd have a hard time with the "Gen 1" G26 back in '88, because that model didn't come out until 1995. Now a protoype of a G21 that would come out three years later, well maybe. Like you said people's memories get fuzzy, considering it was nearly 25 years ago.
However I deal with, on an infrequent basis, an older individual that works in a brand new gun shop in Lewisville Texas. He claims that the Gen 2 G23 on his hip was made in 1989, and that .40 S&W was around since 1984. How does he know these things, because of his brother that worked at S&W at the time. I've tried in very friendly ways to let him know that the G22 was the first .40 S&W gun put out by Glock in 1990/91, after seeing specs for the .40 S&W cartridge at Shot Show of 1990. He absolutely is adamant that he is right, though he will not do a serial number look up on his "1989 Glock 23." Fortunately he's the only one like this at said establishment. Everyone else from the owner on down is excellent, and even this guy is pretty decent, just grossly misinformed about his gun.
Best,
Dave