Only two of those letters contains the engine code...
It's 1500 or 1600...
The first two letters do not correspond with any two digit engine
code that I see.
Type 1 Code - Year -Engine – Remarks
4 – 60 – 1200 – 40 HP
5 – 61 – 1200 – 40 HP
6 – 62 – 1200 – 40 HP
7 – 63 – 1200 – 40 HP
8 – 64 – 1200 – 40 HP
9 – 65 – 1200 – 40 HP
FO – 66 – 1300 – 8mm oil pump studs
HO/TO- 67 – 1500 – 8mm oil pump studs
H5 – 68-69 – 1500 – 8mm oil pump studs
B6 – 70 – 1600 – Dual Relief – single port
AE – 71-72 – 1600 – Dual Relief – Dual Port
AH – 73-74 – 1600 – 8mm Head studs w/case savers
AJ – 75 – 1600 – Fuel injected, no fuel pump mount.
Type 2 Code - Year -Engine – Remarks
Numerals 61-63 – 1200 – See type 1 40 HP
O – 64 – 1500 – No Cam bearings
H - 65 – 1500
HO – 66-67 – 1500 – No Cross member holes
B5 – 68-69 – 1600 – 8mm oil pump studs, single port
B5 – 70 – 1600 – Dual Relief
AE – 71 – 1600 – W/cross member holes
Late Bus
CB - 72-73 – 1700 – Dual carb, manual trans
CD - 73 – 1700 – Dual carb, auto trans
AW – 73-74 – 1800 – Dual carb, manual or auto
AW – 75 – 1800 – Fuel injected
ED – 75 – 2000
GD - 76-79 – 2000 – 79 had Vanagon heads
GE - 79 – 2000 – Cal only, Vanagon heads
Type 3 Code -Year -Engine -Remarks
O - 63-65 – 1500 – No Cam Bearings
TO – 66-67 – 1500 – 6mm oil pump studs
UO – 68-69 – 1600 – Fuel injected ‘69 w/xmember holes
UO – 70 – 1600 – xmember holes, dual relief
U5 – 71-73 – 1600 – like UO w/xmember holes 7.3:1 compression
X - 72 – 1600 – 7.3:1 compression
After Market Cases Code -Year -Engine -Remarks
F1 – 13/1600
F2 – 13/1600
DO – 40-HP part when last digit is “X”
D1 – Some times a 40-HP part
AB – 66-79 – 1600 – Built since ‘73 in Mexico, Brazil and Germany
AK – 67-74 – 15/1600
AM – 1600
AS – sometimes listed as a Super Beetle original case ‘73 and later.
Type 4 Code -Year -Engine -Remarks
W – 71 – 1700
EA – 72-74 – 1700
EB – 73 – 1700 – Calif only
EC – 74 – 1700