If the 'Fortress' was 3G135, what and when was the 3G71? all I know is pre-1962.
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If the 'Fortress' was 3G135, what and when was the 3G71? all I know is pre-1962.
Welcome here Chris.
I can add that the 3R36 was in Chubb's 1971 catalogue, but not 1978. I don't know when it appeared.
Incidentally, even in 1978 the detainers on these two have no lip at the bottom to prevent overlifting above the probe, but there is a moulded plastic piece above.
However the 1978 detainers in both 3G135 Fortress (see Huw's phots), and 3G110 Castle do have lips. 3G135 is not in the 1971 catalogue.
Cheers Chris, is that the Manchester Chris Taylor?