[SFwatchGuy]

Is it possible you have a Longines Clous de Paris Power Reserve and not the watch you think? The movement you have is supposed to be used in this watch. By the way, there are many pictures available on the internet for these movements.

 

[SFwatchGuy]

This picture from a prominent on-line retailer seems to show the L693.2 movement although the write up says it has the L602. Maybe Longines did a switch.

This is supposed to be the L602.

 

[SFwatchGuy]

It seems to depend on where you look. Some references indicate the watch you have, L2.666.4.78.3, comes with the L693.2 movement.

 

[SFwatchGuy]

If it's any consolation the L693 power reserve is 46 hours while the L602 is 42. The L693 also has 24 jewels compared to 21 for the L602 and the L693 is based on a more modern ETA A07.161 while the L602 is based on the ETA 2897.

https://r.search.yahoo.com/_ylt=A0geK.XKXo1iORoAjgFXNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1653460811/RO=10/RU=https%3a%2f%2fwww.longines.com%2fuploads%2fcustomerservice%2fuserguide%2ftechnical%2fpdf%2fEN_MechanicalMovements.pdf/RK=2/RS=_qruvUaZJAOhWfE8WYWJge1LdGg-