The Bvlgari Octo Finissimo collection has broken three (3) world records over the past few years: thinnest tourbillon (2014), thinnest minute repeater (2016 -- if you have not heard one of these chime, you are missing out) and thinnest automatic with a secondary petite seconde dial. For its size, it has an incredible 55 - 60 hour power reserve (powered by a platinum micro-motor). I bought the model with the titanium case (5.15 mm thick), and the titanium bracelet featuring a steel folding clasp. To me, the titanium bracelet is a natural extension of the titanium case and was more appealing to me than the black alligator strap. It is crazy thin, feather light and is thinner than the Altiplano by 0.12mm (in haute horologerie, this seemingly negligible difference is a feat in and of itself). I have posted two photos of this timepiece with the titanium bracelet (credits: photos are from the Bvlgari website - not my images). The matt sandblasted finish is not to everyone's taste, but seeing it and wearing it in person is a whole new experience and is only appreciated by seeing it in person. It's a little pricey, but definitely worth the money (the Altiplano is almost twice the cost) -- and compared to its sister pieces, the tourbillon and the minute repeater, the Automatique is a steal -- about US$15,000 depending upon where you but it. I I love everything about this watch and would encourage any watch enthusiast to at least check it out -- if not to buy, then to hold, feel and admire. There is so much I could say about this piece -- I'm a huge Bvlgari timepiece fan (I have four different Bvlgari watches) -- but I think there is enough literature and info out there for the watch enthusiast to peruse and absorb.
Octo Finissimo Automatique with Titanium Bracelet

Case back showing the BVL 138 caliber