Body Type: J = Challenger R/T
Price Class: S = Special
Body Type: 23 = 2 Door Hardtop
Engine: G = 318 150HP(net) or 155HP(net) 1-2BBL 8 CYL
Year: 2 = 1972
Sequence Number: 453115 = 353115th Vehicle Built

Agree with above, you're missing the (2) as in "23".

Here is a decoder:
VIN Decoder