That is the
Ladies lavatory basin. The hole on the left is for a spray head for shampooing hair. A slightly larger men's Lavatory was also made, no spray head hole.
There is a new man's Lav. made today, cast iron, either as a self rimming, or under mount.
According to my 2017 Kohler full line counter catalogue, there is no pinkish color currently. I think that one was called "innocent blush". They also had a deep red, as well as the raspberry puree.
However, more than two cast iron bath tubs are still made. Belweather, Birthday bath claw foot, Dynametric- it's very retro mid century, Iron works, Highbridge, Memoirs, tea for two, a "soisson's" drop in, Seaforth, mendota, vintage, and villager. A few can even be jetted.
In addition to their acrylic tubs, choices abound in the Kohler tradition.
We removed our master bath tub, and got a Kohler Salient cast iron shower base.
It also has the etched in non slip surface. Depth of color in cast iron is better than acrylic, or even vitreous china. Cast iron also keeps bath water warmer.