More hallmark help?

[buzzhead]

Anyone know this hallmark? I've narrowed the piece down to a vintage bubble blower.

 

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[diggummup]

I found a couple like yours but both of them are "unknown". The letters CQ inside a rectangle looks like to me, other than that I got nothing right now.
https://www.etsy.com/listing/164798029/sterling-silver-bubble-blower-pendant
https://www.etsy.com/listing/216141293/vintage-sterling-silver-bubble-blower