I think that's a Barkley-Grow T8P-1 ??
I think you're right.
CF-BQM at the Calgary Aerospace Museum, with one of her floats in the foreground.
Not a very popular aircraft in the US, because of its fixed-gear. However, Canadian operators used it successfully on skis and floats.
BQM, on floats, was used to ferry Princess Margaret around the BC Coast, during her visit in 1958. I've been unsuccessful in finding a picture.
The tail behind belongs to CF-PAT, Twin Otter Serial Number 2. The highest time Twin Otter in the world - 25,503 hours!