The oldest custom keyboard I still own. Built on October 17, 2017!
Not the first keyboard I built, but the one I used the most. Since I originally built it in 2017 I used it daily for around 5 years. Had to resolder it at some point because original PCB failed.
Built with highest-end (at the time) switches - Zealios, which I tuned myself (lubed, stickered, replaced springs).
It actually had everything I could dream of: Unique underglow, backlighting, amazing tactile switches, PBT Cyrillic keycaps.