I realised that, and edited my post before I read your reply :D
I have contacted 3 local museums to try and help you.
I'll keep you posted. I assume that you want the entire original switches, but would you consider any form of reproduction?
Thanks for your kind comment.
I have not seen that type of cover, but you might try the folks at the following link, unless you have already:
Calgary Mosquito Society
Oh-oh! I just noticed your location - Calgary!
Some of you may be interested in seeing my collection of aircraft instruments, tools, and fittings.
Where I have had to disassemble items for cleaning lenses, mirrors etc, I have included photos of the insides, with explanations.
These are in the "Special Detail" section, along with Aldis lamp...
Although the stamping raises it a bit above domestic use, (garden tool handle holder etc.) there is no military logo.
This pushes me back towards the flag pole idea. I only collect Allied aviation bits, so I'm used to seeing A*M even on components.
Hi Will,
OK, we're talking about the same man.
I suggest that you raise that point with Malcolm, I'm certain that he will sort it out for you.
For all others who are interested:
https://www.raf-surplus.co.uk/air-publications-other-books-and-cds.php
Regards, Mike
Those slots and screw holes definitely look like they're designed to hold something slightly flexible, like wood.
I tend to agree that it could be a small flag pole mount, as it also has screw hole in the base for probable attachment to a flat surface.
Yes, marine rather than aeronautical, but...
You need to be more specific, as there's AP1275A for general instruments, and AP1275B for navigation instruments.
They are both hundreds of pages long, and full of useful internal details and even how to use in some cases,
I bought complete copies of them years ago, and my source relied on them...