Rare Antique Duroni & C. Milano Back-to-Back Pocket Barometer Altimeter Compendium (Late 19th – Early 20th Century). Up for sale is a highly collectible and exceptionally rare matching-piece antique pocket scientific compendium. Crafted by the renowned Italian scientific instrument maker. ? KEY FEATURES & SPECIFICATIONS. Top Dial (Barometer & Altimeter). Measures atmospheric [...]