Looking for a nice brown (preferably) leather strap with white stiching for my Montblanc Timewalker Pilot Chrono. What size is this, 21? I'm not really sure and what would look good. I have had the steel strap on it since I bought it and am getting tired of how it looks. Also, could someone help me decide what kind of alternative strap would work for my Breitling Superocean Heritage 46 (black) to the rubber original? Thanks!