No difference
Tim,
The mark of tank would not make a difference in this case. The Gun, 105-mm Tank L7A1 and the Ordnance QF 20-pdr Tank Mk.1 use the same breech ring and breech block, so the mechanism is common through all Marks of Centurion from Mk.3 to Mk.13. (Mk.1 & 2 used a 17-pdr.). I vaguely remember that this tank is a Mk.5 or Mk.5/2, but Malcolm will know for sure.
Mike
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