Our school had an Olivetti PC (286), which was memorable for two reasons: it was faster than my own 286 (surprising because I thought they were running at the same clock speed), and it was the only one. Indeed, it was the only Olivetti PC I'd seen anywhere.

I was 11 when my school got donated an Olivetti 286. This was in the early 2000s and to this day it remains the only one that I've seen and used (it ran MS-DOS 4.0 & came with a manual).