Share 'Daguerreotype Plate Marks'

I've been sent an image of a daguerreotype plate that has a stamped mark in the top right corner, apparently very similar to that shown on the Historic Camera web page of Daguerreotype Plate Manufacturer Marks, i.e. "NP: 40."  The date and location provided there are simply, "c.1840" and "France."   Can anyone give me more precise dates and location of this plate manufacturer, please, or direct m…