They must have been made to a very similar design (or possibily the same design). It's definitely made by Northern Telecom the one here even says "Northern Telecom" and "P+T" on the dial.
On the bottom "Northen Telecom, Made in Ireland" and a little metal wheel for adjusting the volume of the bell.
Wired up to a "headphone jack" style (but with 4 rings) old P+T connector .. (pre 1978 when they started installing RJ11 sockets)
