Mark I Di2?
I‘m not someone who especially gets attached to gear, which doesn’t mean that I’m buying new kit every other week but for me the pleasure is in the ride rather than what I’m riding.
My oldest bike, a Litespeed Tuscany, dates from 2006 but is a true ship of Theseus. Barring the frame it’s been cut and shut to do everything from credit-card touring to sitting on rollers.
On that topic, my old Elite rollers are probably up there. They’re rusted to buggery, have outlasted two dumb turbos and three smart trainers and I’ll be on them tomorrow morning thinking about something else.