Just received an email from Longines Brand Heritage:
Thank you for your email and interest in Longines watches.
Following your request, I have the pleasure to give you here below the information I found in our records :
The serial number 5’272’700 identifies a silver wristwatch fitted with the Longines
manually wound mechanical movement, caliber 18.69N.
It was invoiced to Longines-Wittnauer Watch C°, who were for many years our agent for the USA, on 31.07.1935.
For your information, US Navy officer Philip Van Horn Weems develops the ‘Weems System of Navigation’, a series of navigational devices, based on which he and Longines develop a rotating disc watch, enabling the wearer to synchronize the second hand with a GMT signal, essential for navigation: the Longines Weems Second-Setting Watch. A patent for this timekeeper is filed in 1935.
Hoping this information is convenient to you, I remain at your entire disposal for any additional request you may have.
Best regards,
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