Factory 649
I think this directly relates to the fact that Factory #649 was in the process of being shut down and located closer to NYC. There has been a lot of research done on this issue as Factory #649 seemingly disappeared for a couple of year. Ultimately it would be moved to Brooklyn at the area that later became known as the House of Mecca.
I think this also explains why we see some of the same anomalies in other sets like T201, T206 etc. I do not have access to my notes as I am out of the country, but can look up when I get back.
z Wheat
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