I'll take some images of my various MDs sometime either tonight or later this week. I have one MD1 VA2, two MD1 VA6, one MD1 VA7, one MCD1 (tray needs fixing

), two MCD2, and a 32X (MK-84000A), all US region.
Incidentally, one of my recent Sega CD purchases included two AC adapters that I wouldn't have expected to get: a Sega 3025 (Sega Master System, compatible with MD1), and an SA-160A (Japanese MD, why was that included with a US Mega Drive console?)
EDIT: I have some board photos posted on
Sega Mega Drive PCB revisions. They're the MD1 VA2 and MD1 VA6 (both USA).
EDIT 2: ...for some reason I kept thinking that my older MD was a VA4. It's a VA2. Derp. I don't notice too many obvious differences between the VA2 board and the VA4 (PAL) board on the Sega Retro Wiki page, other than the different clock crystal due to the VA4 board being PAL.
This post has been edited by GerbilSoft: Yesterday, 01:11 PM
Reason for edit: VA2, not VA4; also link to PCB revisions page.