I have read: "early HRA's" and "late HRA's"
Where was the designated break?
I have an 8/54 HRA serial #5,521,138.
HRA's were produced 1953-1956.
From Scott Duff's book:
1953 - 500 delivered
1954 - 114,459 delivered
1955 - 158,187 delivered
1956 - 155,454 delivered

So, I would assume that 8/54 would be early, but...?
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