https://www.fratellowatches.com/seiko-watches/tbt-the-seiko-ashtray-7c46-diver/

The Seiko Ashtray gets its name from, big surprise here, its bezel that some feel imitates the look of a conference table ashtray (remember those?!?). Somewhat bulbous and round with notches for gripping, it’s pretty easy to understand the nickname.

The Seiko Ashtray, despite having a bit more stylistic flair than its overly functional Tuna counterparts, was really no slouch in the specs department either. It clocks in with a purpose-built saturation diving capable water resistance of 600m.