Very interesting actually. This is the first time I have seen a 5127 with the PP seal.
Several variations of the 5127 seem to have been issued:
• It exists with the 315 movement and the 324 movement.
• It exists with both the Geneva and PP seal.
• It exists with both 60 and 57 minute dots around the dial.
You have one with 324 movement, PP seal and 60 minute markers.
Mine is one with 315 movement, Geneva seal and 57 minute markers:
The 5127 is without doubt the most beautiful Calatrava in current production.
