... that there are two different HP 81161A tapes? One that is black (2232Axxxxx) and a second that is brown (mine has 2449Axxxxx).
Ther are also two sorts of tapes: one is sealed in cellophane that is labeld "Assembled in Mexico" and another that is sealed in a small bag with no printing on it.
There are even two different boxes for the two different tapes. One is 6.5cm x 5.5cm x 14cm and one is 8cm x 7cm x10.5cm. The blue label on the two boxes is the same.
There are more that two different power supplies for the tape drive.
Maybe someone finds two different rechargable batteries or two different boxes for the set (I think there are two, but I only have one yet....