From the Canonical List of Commodore Equipment
First column is the variation, 2nd column is the variation differences via the codes in the top paragraph and if there is a third column it means it has been confirmed by someone who owns one.
AlanD
Code:
VIC-20 Series: 22*23 screen, 5kB RAM, Basic 2.0, one piece.
Could be hooked to TV with RF modulator.
Cream (C), or Off-White (O) case.
Flat top keys with Square type font on keycaps (S),
Indent top keys with somewhat square font and thin letters
for RESTORE/CLR/HOME/INST... (I), or
Indent top keys with rounded type font (R).
2 Prong PS adaptor (2) or DIN PS adaptor (D).
Black/Silver Decals (B), or Brown/Color Decals (H).
5 pin video connector (5), or 8 pin video connector (8)
"2" implies VIC-20 motherboard. "D" implies VIC-20CR
motherboard.
* VIC-20 1 SOB2
* VIC-20 2 ICHD
* VIC-20 3 ROB2
* VIC-20 4 RCHD8 JB
* VIC-20 5 SCHD JB
* VIC-20 6 VIC with 2001K Keyboard. MS
* VIC-20 7 RCBD5 SD
* VIC-20 8 CS2B5 RN
* VIC-20 9 CI2B5 RN
* VIC-20 10 CIH25 BZ
* VIC-20 11 ROBD5 BZ
* VIC-20 12 RCHD5 MG
* VIC-10 Japanese VIC with 2001K keyboard.
* VIC-1001 VIC-10? Japanese VIC with both chars printed on keys. TG
* VC-20 1 SCHD5 (German) (source says has beige instead of grey? case)
* VC-20 2 RCHD5 (German) MH
* VC-20 3 R5OB2 (German) Color VIC logo... CE
* VC-20 4 HD (cheap label) (German) RC
* VC-20 5 HD (better aluminum label) (German) RC
* VC-20 6 2 (UK) RC
Gold VIC Commemorating the 1 millionth VIC-20 made in the U.S.
* Silver VIC Commemorating the 2 millionth VIC-20 made in the U.S.