Longines Case Numbers: An Introduction

Seiji · Apr 6, 2023

Dan S
Is the number you called the "iteration number" the one sometimes stamped on the back of a lug?

The individual number is often stamped below the order number on the generation of watches after serial numbers on cases is discontinued.

The numbers on the lugs is not used until removable casebacks are used on later watches. And I believe they are also the individual number.

The individual number is the unique number assigned to the watch for an order.

DirtyDozen12 · Apr 6, 2023

Dan S
Is the number you called the "iteration number" the one sometimes stamped on the back of a lug?

No. As far as I know, the numbers that appear on lugs are individual numbers within an order or iteration. Below are two examples. I added labels for clarity.

Source: https://www.marcelswatch.com/en/product/vintage-longines-6242-sei-tacche-1951/

Source: https://www.ebay.com/itm/1344317539...b&brand=Longines&_trksid=p2047675.c101224.m-1

Dan S · Apr 6, 2023

DirtyDozen12
No. As far as I know, the numbers that appear on lugs are individual numbers within an order or iteration. Below are two examples. I added labels for clarity.

Source: https://www.marcelswatch.com/en/product/vintage-longines-6242-sei-tacche-1951/

Source: https://www.ebay.com/itm/134431753915?_trkparms=amclksrc=ITM&aid=1110006&algo=HOMESPLICE.SIM&ao=1&asc=20200818143230&meid=c00d5f6ab0a14561a9d46ec127be9a41&pid=101224&rk=2&rkt=5&sd=114025226623&itm=134431753915&pmt=0&noa=1&pg=2047675&algv=DefaultOrganicWeb&brand=Longines&_trksid=p2047675.c101224.m-1

Thanks, I misunderstood what you meant by iteration number. 👍

Longines Case Numbers: An Introduction

Seiji

DirtyDozen12

Dan S

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