I picked this up at an estate sale today. No patents or serial #’s. Says” Gillette and made in USA” on base plate. Top cap & base plate say “36” on them(prototype ID?). Top cap and handle are brass the base plate is plated it seems or varnished brass. I spoke with Matt from razor emporium and he said he has never seen anything like it & said it’s a prototype. Should be late 1920’s. Short of looking for patents for dates anyone seen anything like it. Any idea?