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Yet another "missing" number
In Response To: Re: The Other Missing Number ? ? ? 1143 ()

This is one that I've brought up before, but I've yet to resolve and it still intrigues me.

In the 5100-powered chronographs, there is a run of watches with references ending -3.

You have the:

510.503 - Pewter "no-name" 510
510.513 - Cortina 5100
510.523 - Carrera 5100 (in stainless steel)
510.543 - Israeli Air Force (A.M.I.) 510

So where, and what, is the 510.533? Another military version? An abandoned model?

Does anyone know or have any insight into this missing reference?

Current Position
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