Antique show pick-up

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Whatever the precise caliber, it's an Eterna, as the (big jewel) shock protection on the OP's example suggests.
 
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Very nice pickup! Birks Rideau were a line of dressier watches, many having Eterna movements. But I have a couple of chronographs with Vajoux movements, and at least one that maybe related to Breitling in some way. I also have an older Rideau with an A Schild movement.
If you tire of this one, let me know.
 
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These are a couple of my Birks. I have a fortis spaceleader from 1974. Just picked up the Rideau 25 jewels. Love the mystery of Birks watches