Ericsson N1071A15 - HB900

[dsk]

Thank you, then we just keep on...

It is at least 2 different theories about the reverse dial.
1: It was a way to not get in conflict about design and patents.
2: the 7A was among the first exchanges who stored all the dialed digits in the number in a register, before executing the operations needed to connect to the other end. The backwards counting made this easier (by designers opinion) to perform a logical register unit.   

My guess is the number 2 answers right, after testing this they realized that of course the movements and storing would be working even with a normal dial.

The third dial I have seen are Swedish. Regarding this, I guess they wanted to protect their own marked.

dsk