Gas Council Number:E24029. 24 Mark 1 Serial # Up To 161380001 47-094-27 MARK 1 (161380001). 24 Mark 2 Serial # 161380001 Onwards 47-094-27 MARK 2 (161380001). 24 MK 3 (Serial # Ref. Contains ‘X’) 47-094-27 MARK 3.
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