Unfortunately, I never kept any of my old consoles.
Besides, I have most of the ones that mattered in emulation form on the PC now anyway. C64, NES, SNES, Sega Genesis/32X/SegaCD, PS1, etc.
The oldest game system I still actually have is an original no-backlight GBA.
Over the years, I've owned so many systems.......the above mentioned, plus 3DO, Vectrex, Atari 2600/5200/7800, friggin' Magnavox Odyssey (Pong), Intellivision, Colecovision, Magnavox Odyssey II.....I KNOW there are a couple I'm forgetting.
My all-time favorites were SNES and Genesis. Man! Those were the days of the great games. Most games nowadays just don't seem to have the fun-factor that they had back then.