Just looking up 'vintage encased lucky penny keychains' I found a bunch on ebay and one on Etsy. The prices start at a dollar and go up to $10 or more from what I saw.
I couldn't read the back well enough to help with any information about the store but it's unlikely that I would know about it.
I think that these items don't wander too far from their home states and you might find out about the store on the website for the local historical society or library.
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