The chair was designed sometime between 1950-1953.
Here is an interesting blurb I found:
Spanner Products distributed the line through the Simpson's and Eaton's department stores and through small, independent dealers in Toronto, and, occasionally, elsewhere in the province. Once the public became aware of Ruspan, the factory could not keep up with demand. Russell Spanner's habit of jumping up onto his furniture may have stemmed from his early experience as an amateur wrestler. A Globe and Mail article from 12 January 1954 reproduces a photograph of Russell standing on an Originals coffee table at the Canadian Furniture Mart. The article describes part of Russell's design process as follows: 'He will take the design to his uncle, Oliver Spanner, and the two will retire to the woodworking shops and manufacture a prototype. Then, for several hours the chair will be kicked, dropped and thrown. Russell Spanner will stand, jump and bounce on it. If it survives, it will be deemed worthy of further consideration.'
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