Working Instructions Manual for Wireless Set No. 52
 

One of these is currently on eBay.co.uk

https://www.ebay.co.uk/itm/354747042...MAAOSwv~pkSlth

The description says it has wrinkled pages so some degree of water damage may be possible. Also, a quick test of the seller seems to suggest this item may not be shipped directly to Canada, so plan for a UK middleman to pass it through, if you need to purchase.

Beyond that, I know nothing about the seller.

David