I think I've worked out what he means. The last time it was up for auction (Spink 2003) it was sold with a 1967 OMS. As per the description:
Elizabeth II, Mistruck off-metal Pennies (2), 1966, struck on a foreign brass flan, possibly Jamaican, 1967, struck on a smaller diameter foreign flan, therefore no rim.
I think the description has just been lifted from there and amended incorrectly, as the rim is very much present on the 1966.