Both the twin 25-pdr and 17-pdr were assembled onto existing 'E' series hulls - the three tanks the AFV Workshops used for experimentation.
The prototype AC3, serial 8066, with (single) 25pdr is held in storage at the AWM in Canberra, and is visible at the storage facility open day(s) each year.
The AC4 never actually existed beyond the experimental 17-pdr mounting on an E series hull.
Mike
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