Hello friends! Today I would like to share with you my Longines: So, Longines "Tre tacche" reference 3925, the first version with a 30mm steel case (acier inox staybrite). Double signed sector dial is marked by Longines and Herpy Arnold Budapest. Radium syringes hands and central sweep seconds. Caliber 10.68Z. In response to my request to Longines, I received the following information: "The original serial number 5'683'695 identifies a wristwatch in stainless steel bearing the reference 3925 and the order number 2120. It is fitted with a Longines manually wound mechanical movement, caliber 10.68Z. It was invoiced on 28 January 1939 to the company Arnold Herpy, which was at that time our agent for Hungary." Arnold Herpy started his business in 1817 in Budapest, Hungary. His store was located at Petőfi Sándor utca 17 and assortment included Longines and Movado. Unfortunately, during the Second World War, the store burned down and was closed. After the war, his son Gyula Herpy relaunched the store from scratch, but the store was subsequently nationalized. Thanks for reading. I will be grateful for any additional information!