Good point, Rob. The info came from a Ford Australia information newsletter, and the 1940 model engines (prefix 1A, 1B, 1C and 1G) all have 'last engine assembled' dates in May, June, July and November 1941 respectively. So if it's a typo, it is one repeated across all four engine prefixes.
For the 1941 engines, the '2G' prefix is listed as first engine assembled (2G219F) in Jan 1941, so quite an overlap in usage in Australia at least. There is not 'last assembled' in the 1941 list, so you'd have to think they were still using '2G' prefixed engines in April 42 when the bulletin was issued.
All very curious!
But in Dave's case, I think the number stamped onto the chassis rail is without a doubt, the number of the engine originally assembled to that chassis.
Mike
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