Spotted: linen sigma Rolex Datejust 1601.
I must say – these Sigma dials are my favorites. Not because of the Sigma.. but look at the shape of the markers. I once had a blue Sigma 1601 with these exact markers.. Such a work of art!
Check it out at my friends of Amsterdam Watch Company: http://www.awco.nl/index.php?taal=1&id=3065&spec=2