Hello All! Just acquired this superb 145.012-67 ... dial, bezel, case, and hands are all in what appears to be amazing shape. I have a question though, on the back of the 11 o'clock lug is an engraving: "1373m" (seen in the second picture) Anyone have an idea of why that would be there? Or what it's significance might be? My assumption is there is no importance, but who am I to deprive our imaginations of a treasure hunt? Cheers!