The wall-mounted counterpart to the 706 was the 711. Naturally, when the General Post Office switched to the updated 746 telephone there followed a wall-mounted version of this updated telephone.
This was the 741, which was introduced in 1968 and replaced the 711. It had a similar case to the earlier wall-mounted telephone but had the internals of the 746 including the built-in regulator.
Compared to the 746, the 741 had a quite different case (see below for side-by-side comparison). The 746 is designed for desk use so needs to present the dial at an angle to aid dialing, the 741 needs to present it's dial "flat" to the user for the same reason.
The 741 has an integral bracket for mounting securely on the wall. The handset rests atop the modified case. Our 741 has "KS" scratched on the case, perhaps these were the initals of a previous owner, presumably not Keir Starmer!
