Toronto. I always thought Stewart-Warner made meters and gauges. But no, they also briefly made movie cameras before the company was reorganized and transformed into a winner from a loser.
The gory details of the company and its rebirth are told by the “Made in Chicago” museum (a fascinating site that I have quoted many times).
My thanks again to that intrepid researcher and long retired cinematographer (and still photographer), George Dunbar, for finding and sharing this advertisement with us. Oh, yes – the ad is from the July, 1933 issue of the American Cinematographer (1933 was the year of revolt at S-W and its rebirth).