I've been away for a few days.
That's a cool thing! The 150 only is the known pattern, and pretty much confirms the idea for that sheet.
It might not for any other sheet.
If it doesn't work for the other sheet, that might indicate the two sheet fronts being produced at the same time.
OR
That multiple sheet fronts were made and stocked, then printed with backs as needed. Which seems less likely.
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