Nitto S65 Crystal Fellow seat post
This seat post has a curious name, and is the standard and most popular Nitto post. It's a one-bolt design, so set-up is fast and easy; and so long as you grease the bolt and use a long 6mm allen and put some muscle to it, it'll grip fast forever and that'll be that.
Like all Nitto products, it is both jewel-like and Samson-like, and you cannot get any better. But if you weigh more than 220 or so, look into the S-83.
Offset is approx. 18mm from center of pillar to center of cradle.