It’s tricky to see, but if you look at the back of the display, through the clear epoxy, to the little circuit board within, you should be able to make out a “1” by pin 1, and a “16” by pin 16. These follow the normal IC numbering convention of increasing counterclockwise when viewed from the top of the device. Once you know the numbers, the datasheet has a diagram showing which pins go to which segments. Let us know if you need further assistance!
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