[Grady Clay]

VIN
WP0ZZZ91ZHS109716

WPO = World Manufacturing code
ZZZ = VDS code USA
91 = 1st and 2nd digits of type 911, (93 = Turbo, 95 = 959)
Z = Test digit
H =Model Year (1987)
S = Manufacturing site (Stuttgart)
1 = 3rd digit of type 911, (0 = Turbo, 9 = 959)
0 = Code for body (Coupe) and engine (930/25)
9716 = Serial number (Number range = 911 Coupe, Japan, 930/25 engine)
note: This Number range starts with Serial number 9501 and ends at 9999.


Engine Number
64H05790

6 = 6 cylinder
4 = 911 Carrera R.o.W. with M298 USA
H = Model year (1987)
05790 = Serial Number


Engine Type
930/25 = USA, Japan M298


Transmission Number

74Hxxxxx

7 = Transmission for 6 cylinder
4 = 5 speed 911 USA, Japan M298
xxxxx = Serial Number (5 digits)


Source:
Porsche Service Information Technik ‘87 (WKD 493.321) pages 0-07 to 0-09.

Best,
Grady