Nitto SP-6 chromoly layback seat post - stamped Nitto on front of post, a couple inches below the bend.
Length: Tube length is 452mm, but overall "height" is 410mm - minimum insertion is 80mm from the end. Therefore, maximum (theoretical) seat high is 330mm. I say theoretically because depending on your weight, you'd never want to run a layback seat post with only 80mm in the frame - please use common sense when installing.
Diameter: 22.2mm (7/8")
MADE IN JAPAN