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Watches came in different case standards at different price points, typically for ladies 18K solid, 14K solid and either 20 years or 25 years gold filled, platinum and the SS for mens watches.

We have a number of adverts showing how the model number varied due to a number of factors; movement ligne, case material, movement jewel count and watch type (wrist vs pocket).

The 6720 is listed as the 18K sold gold version with a 17 jewel movement, but to differeniate the variations for each model a unique number would have been used to track orders and sales.

Whist we have no direct advert showing a 6519, we have enough evidence and discussions over the last 10 years to determine a general consensus.

Here is part over the overall model taxonomy list we have built up over the last 10 years which shows the various model numbers we have determined to exist through one mean or another. I've just added the 6519 to the list and you can see that it is not out of place in the list.

6511

6513

6514

6515

6516

6519

6520

6713

6714

6714-S

6715

6716

6716-S

6718

6720

6722

6724

This list is by no means complete, but again shows what we have identified thus far since 2006.