John,
If your referring to CASTING number IIRC I don't think it mattered as the short blocks were the same year to year 1BC and 4BC.
Once a block was pulled and a designation was assigned it would get "Stamped/Coded" and built from there.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
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