I have loaded a SD card with Raspbian Stretch and attempted to boot the Original RPi I got in 2012.
OOC, when in 2012? Was it a "B1", with the extra USB polyfuses, or a later "B2" with only one polyfuse? How much memory?
FWIW, October's version of Stretch Full was/is running fine on one of my B2's:
http://www.cpmspectrepi.uk/raspberry_pi ... iPiTV.html
(The USB polyfuses on my B1 began to give me problems some time ago so I haven't "used it in anger" for quite some time)
Still running Raspbian Jessie on some older Pi's (an A, B1, B2, B+, P2B, 3xP0, P0W) but Stretch on my 2xP3A+, P3B+, P3B, B+, A+ and a B2. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm