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Its a pattern mentioned a couple of times I believe in the article in the Library on Date coding 9CAYes, month, week
FYI it is not a heavy duty solenoid. Just one from a different MFG that is a different style. The internal components are the same as in the more typical other style solenoid. They were dubbed "heavy duty " for lack of a better explanation by those who hadn't opened them up to compare the difference between the two. The term stuck. "Flat style "solenoid is a more appropriate and accurate description.
Okay thanks Bob. I'd been led to believe that they were used on the big blocks.