Longines Presence L4.714.6, 18K – need help confirming exact model/year

Hi everyone,

I'm looking to buy this Longines soon and would appreciate some help identifying it more precisely before I do.
Details I have:

• Reference: L4.714.6 (Presence / La Grande Classique family)
• Case: 18K solid gold, hallmarked 18K/750
• Serial number on case back: 30154439
• Automatic movement – I believe it's the Longines caliber L619, based on the ETA 2892-A2

Could anyone help confirm:

1. The approximate production year for this reference
2. Whether…

Longines Presence L4.714.6, 18K – need help confirming exact model/year