The chair is currently in my possession!
I will post some pictures of it. The porcelains look like CPR's, but I'll have to see if they are the incuse style versus the ink stamp style. The dark aqua is a "B" 145, and the light blue is a Canpac [170]. The paint is very old, with the last coat being a very institutional blue grey, being applied at least 40 years ago. Underneath is a coat of white, and the original colour is a yellowy orange.
The chair has sparked interest amongst some train buffs in Ottawa as well, and I am going to use this an opportunity to get some of them down to the OVIC show.
Chris