The Ingenieur SL, commonly known as the Jumbo, was designed by Gerald Genta and released in 1976.
Considering its age, the case and bracelet appear to be in very good condition, and it is a rare piece that comes with a warranty.
The manufacturer will perform a complete service and polishing in 2022 and 2023, so you can wear it with confidence as there are no noticeable scratches.
*The dial, bezel, crown, hour and minute hands, crown and rotor have been replaced and the serial number has been re-engraved.