Hello, I am new to this forum. I have found a lot of useful info in this forum that helped me to choose my new watch so I though I would contribute some. I purchased the Longines Flagship Heritage from an authorized retailer last week. I have been an owner of 4 fine swiss watches all from authorized dealers in the last 8 years. So I speak with some experience in quality time pieces. My longines since day one is keeping an impressive accuracy of plus or minus .25 seconds per day based on www.timeanddate.com . I contacted longines by email yesterday to inquire about the movement used in the longines. The movement is Longines Calibre L615 which is obviously stated on their website. The info that the longines rep gave me is: [First of all I want to thank you for your interest for Longines.
Your Longines timepiece is equipped with caliber L615.
We are pleased to inform you that this movement is based on ETA Elaboré with a power reserve of 42 hours and is later decorated and adjusted in relation to our technical specifications.] and in a follow up email: The accuracy of this movement is 0/ +10 seconds per day. I hope this info will help anyone in the market for a new watch as I could not verify the grade of movement prior to this email. The other watches I have owned or do own are: Omega seamaster 300m, omega seamaster 300m Chrono, tissot le locle, all automatic, both of the omegas certified chronometers. I had never heard of longines until last month. I was in the market for a more dressy type watch than the sporty omegas. I ended up purchasing tissot le locle automatic in white with metal band. Within a few days I quickly became aware I was not satisfied with the finish and fit of my tissot. The crown was too large and would dig into my wrist, and also would pop out the date adjust every once in a while. Plus, the lugs were very sharp on the back of the case which did not help with comfort. I could still wear the watch, but not very happily. On the plus side, the tissot is keeping a maxium time variance of plus or minus 2.50 seconds per day, with an average of plus or minus 1.00. My longines on the other hand is very comfortable. the crown is a very nice size and winding the watch is silky smooth and the sapphire crystal is almost invisible and has a very slight barely noticeable dome shape to it. plus the leather band with alligator top leather is super soft and comfortable. So comfortable I can easily forget I am wearing it. well, that is my long poorly edited short review.