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Old 27-08-17, 02:33
Grant Bowker Grant Bowker is offline
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Join Date: Jul 2006
Location: Ottawa, Canada
Posts: 2,285
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As follow-up----->. The flea-market find had the end flap of the box marked:
DURO DYNE
Fire Damper Hardware
FBBKP-39
Coil Spring
Quantity 50
Duro Dyne of Canada Ltd. Montreal
The spring was wound form 0.0495 or 0.050" wire (depends on where I measured) to make a 0.50" outside diameter coil, 2-7/8" between insides of the hooks, length of the coiled portion 2-5/32"

Durodyne still exists, still has a location in Lachine (part of Montreal) http://www.durodyne.com/ A quick check didn't find the springs on their website but I'd be happy to be shown the link.
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