Ricoh Aficio 551 Copy Reference Manual page 200

Copying
The relationship between the direction in which you set the original and
stamp orientation/position is as follows:
2
You can change the stamp position to top, bottom, left and right each way in
1mm, 0.1" steps. See "Stamp position" in
A
Press the [Edit/Stamp] key.
B
Press the [Stamp] key.
184
GCSTMP5E
P.323 "Preset Stamp".