Buttset used in Norway (ITT)

[dsk]

I got one mentioned here http://www.classicrotaryphones.com/forum/index.php?topic=4880.msg61717#msg61717
It is actually one the worst phones I have used in hence of voice quality. It has a dial with both normal and reverse numbering.
The 22.5 V battery makes the line CB in case you shall talk to a CB phone.
dsk

[RB]

Interest5ing.
Looks like the top half of a trimline!
Is that 22.5 v battery easy to find to replace it?

[dsk]

I have not tried to get one, but I guess this one will be OK:
https://www.ebay.co.uk/itm/Battery-Alkaline-Battery-80-mAh-Replaces-Eveready-505-EVER-22-5V-/153478781187