Bren Gun marking disc ?

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I have what I think is a Canadian made Bren No.1 butt stock .It has a what, I think is a missing marking disc. It is located on the right side between the ring for the sling and the operating slide cover .The cut out is 7/8''of inch in dia. . Is this for a marking disc , and was it used only on the Canadian built No.1 Bren Gun ? Can any one tell me where I get one ? If it is a marking disc were they ever used in service to mark any thing ?

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