First, your latch is 47-51 as in 52 they changed to the push button. I could be mistaken, but I seem to remember the company Cowles stamped in one of my latches, catches or hinges. Your right about the packaging, not from the forties or early fifties.
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Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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