https://watchclicker.com/seiko-baby-alpinist-spb159-sbdc119-review/

In 1959, Seiko released its very first tool watch, the Laurel Alpinist, specifically designed for Japanese mountaineers. This model was made to be robust and elegant, so that Japanese men working in offices Monday through Friday could literarily jump into their hiking clothes at the end of the work week and hit the summits, all of this while wearing the same watch. The Alpinist line went through various revisions, for example the famous Red Alpinist line of 1995 which codified the unique dial layout: Arabic numerals on the even markers, shark-tooth markers on the odds, and an inner-rotating compass bezel; and more recently, the SARB017 released in 2006 that became somewhat of an icon.

This model was updated in 2021 and in the same year, Seiko produced what has been nicknamed the Baby Alpinist line: a watch with a smaller case profile and no inner rotating bezel, which is truer to the original model in that it is more versatile than say a SARB017. The Baby Alpinist comes with a green dial (SPB155/SBDC115), black dial (SPB159/SBDC119), blue dial (SPB157/SBDC117), and a two-tone dial in the reference SPB211. Seiko being the brand that has the largest catalogue of any brand, it was meant to, at some point in its long history, release a collection that could rival the Rolex Explorer in terms of sturdiness and style...