sanro
594
Thank you, Professor!
Really, thank you so much for the technical and historical input! 
Being able to even give me an approximation to the birth date has definitely impressed me. Also, I now know the cufflinks are about as old as I am!
As you say, it it the contrast and the size that makes these special. I have a pair of GP and a pair of Longines too, but they are too small and not as noticeable (since also they are all in silvery color).