Rear Loader Beach Bomb Type B has the correct non-production base and body, as well as other charcateristics of the RLBB.
The first casting (Type A, 1st Run) had a short rear engine cover; this casting (Type B, 2nd Run) has a longer rear engine cover. This change was made to provide a physical stop on the chassis for the engine to rest against during assembly.
This is the rarest car in the redline series, and possibly in the whole diecast market. Only two are known for sure, and one has recently sold for over $100K.