Dajia Seatpost, multiple sizes
The Dajia seatpost is a solid and well-proven single-bolt design. It's also one of the few seat posts still available in several sizes to fit classic steel frames.
The non-notched clamp allows for more accurate tilt adjustment than do many inexpensive seatposts. The finish is polished alloy. The head is integral with the post, not pressed on. All-in-all, it's a pretty nice seatpost that should not be confused with lower-end posts. 300mm length; about 24mm setback; 280g