Bookbinding ephemera is fairly rare. Canadian bookbinding ephemera is really rare. A Canadian company advertising desk blotter for an expandable and locking account book post binding? Blue.
Locking and expandable loose leaf bindings are a mechanically complex and under researched sub-catagory of account books. I’m still trying to find an actual example of this binding to examine. I have seen others that incorporate a key and a sliding piece of metal to secure the post binding, rather than the more typical screw head. This part can be locked. Here is a modern version.
Not a lot of information is available online about Business Systems. ” [It] was founded in 1905 to manufacture “loose-leaf accounting systems, perpetual ledgers, order, bill and charge systems, auditing and cost systems” with headquarters in Toronto. Next week I’ll try to untangle a French version from around 1827 with the help of some detailed plans.
The tagline is great — “We make BINDERS that last.” Ironic that it is printed on a disposable desk blotter, which has survived, though. It would be a perfect slogan for any bookbinding school.
Peachey Conservation 
Ah, the ur-Depero Futurista.
http://www.openculture.com/2017/03/depero-futurista.html
Indeed!
Well these look similar to the Pajco Lexide two ring binder I used on my paper route in the 1960’s for customer’s tear off payment coupons. I’ve been trying to locate one of these forever.
Interesting…and impressive you remember the name!
Does anyone know where to find a key for a Wilson Jones end-lock binder?
Janet, if you’re still looking, I found success with a “clock winding key.” The two Wilson-Jones Raven end locking binders I have both opened with a size 6 key.