I have two big regrets (lots of little ones). the first was a Litton 1251 I got in the early 1980s for $25 from the State of Oregon. 5 2X3' components, control, printer, tape reader/ punch and two 200K drum memory units. Played with for a while and scrapped it when aluminum was bringing 80 cents per pound in the late 1980s. Did inventory for the state but all I could get it to do was printout ASCII art. Replaced it with a Xerox 820.
The second big regret was scrapping an Alto in the early 90s. I just didn't recognize it and let it go to scrap. It was part of a large lot we got from Intel in 91 0r 92 that included lots of development systems, II, III, IV. In that lot were an Alto and a Tektronix Magnolia which I didn't recognize till years later. Without skins they were difficult to identify and the Alto terminal was so strange. I was more interested in the 8 Xerox 8010 Dandelions in the lot......and the intel development systems. When I finally saw a picture of an Alto I realized we had the complete system. Paxton Hoag Astoria, OR USA