I've carried out extensive research and the paper stamp, or signet (see photo) allows that identification to take place. Looking at other examples will confirm this.
Bistro Cafe Bentwood Armchair Mundus J&J Kohn Antique 1910 Postage Available
Antique Heavy J & J Siddons No 7 Cast Iron Sad Iron 7lb Flat Iron Doorstop
Fabulous Antique H J Cave & Sons Leather Travelling Trunk
Antique Lorenzini J Uriach Vitamin Medicine Tin Box 1936 Pharmacy Madrid
antique books J.B.Girard Marine engines 1901 vol 1 & 2 CH Beranger paris
