DOXA Sub 300T Searambler - Casey Neistat
The DOXA Sub 300T Searambler worn by Casey has a steel case, the typical DOXA orange accents including the minute hand, orange markings on the bezel.
The watch looks like a vintage watch, with the monochrome, round "aqua-lung" u.s. diver's co. logo on the bottom left of the dial and DOXA logo on the top left of the dial. It looks like Casey got himself a grey strap that beautifully matches the dial of the watch. Aqua Lung is a French diving brand founded in part by Jacques Cousteau, who was a user and fan of DOXA watches.
This particular vintage DOXA watch with aqua-lung logo on a silver dial is not produced anymore but you can find this vintage model DOXA Sub 300T on eBay.
The DOXA Sub 300T with silver dial is still available though, without the aqua lung logo, ref. nr 840.10.021.10 on the DOXA website for $1890, see it here. Or find the special aqua lung model which is available in black and yellow ($4790).
DOXA is most famous fior its dive watches. The names of the watches refer to the dial colors: "Professional" refers to an orange-faced dive watch; "Sharkhunter" refers to a black-faced dive watch; "Searambler" refers to a silver (metallic)-faced dive watch; "Caribbean" refers to a blue-faced dive watch; "Divingstar" refers to a yellow-faced dive watch; "Aquamarine" refers to a turquoise-faced dive watch; "Whitepearl" refers to a white-faced dive watch.
Casey Neistat has worn many different watches in his long history on YouTube: a Rolex Datejust, many Casio watches including the AE1200 and G-Shock watches.
Casey Neistat is also famous for wearing personally customized Ray-Ban Wayfarer sunglasses.