What I find interesting, and it's probably only me, from 1947-1979, Cino Cinelli pretty much stuck to a 4-digit numeric serial system. Yes, there are exceptions, but that puts total production of 10k frames for 32 years, a little over 300/year. I haven't seen a duplicate number, yet
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Something is odd with the math. Or, with me.
I'd heard that 300 frames per year was about the right number as well.