Flat button backmark "IMPERIAL STANDARD"??

[piedmont]

Flat button backmark "IMPERIAL STANDARD"??

I recently dug a flat button with this backmark. No adornment on the front of the button. I have found multiple flat buttons w/no backmarks at this site. Any information would be appreciated.

 

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[vayank54]

Re: Flat button backmark "IMPERIAL STANDARD"??

Don't know a lot about it but believe it's a generic mark used by several makers. It is a British made button though.