Some cards in the 150's were printed three different times.
And I'm fairly certain that the masters were changed between the 150 and 350 series, and that the first P350's were done on leftover sheets from 150 production.
350's also were redone, maybe also 3 times, but usually the adjustments were less obvious.
The 150, 150/350 thing is a start, but a simplification that we should let go.
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