Well done Rosie. Probably a retailer/wholesaler, but also does glass/mirror installations.
Vetreria Medici SNC
Via Viazzolo Lungo 24/2
42016 Guastalla
Reggio nell'Emilia - Emilia-Romagna - Italy
Google maps has a street view showing the shop
Corba Cristalleria seems to be (have been?) an importer of crystal glass in Tuscany. Website dead
www.corbacristalleria.it