Ricoh 816 Copy Reference Manual page 54

Copying
Original orientation and completed copies
The resulting copy image will differ according to the orientation in which you
place the originals (vertical K or horizontal L).
The table shows the orientation of images on the front and back of copies, not the
orientation of delivery.
2
A
Press the {Duplex} key.
The indicator goes on.
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GCRYOU1E
ARC048S