A. Lange & Söhne will issue a certificate for any authentic historic Lange watch. In collaboration with the Glashütte Watch Museum, this makes it possible to remove any doubt whether the timepiece is actually a genuine historic A. Lange & Söhne watch. Additionally, the certificate identifies the first owner, the date of delivery, and the purchase price paid at the time. A copy of the historic sales documents is also enclosed with the certificate. To issue the certificate, which is subject to a charge, we require the movement and case numbers of the watch. More detailed information can be included if a photo or the historic timepiece itself can be submitted.