with it being cut down this post could be one of my old posts, I had them on a few of my bikes and cut them all down. If it is, it is a 4jeri post. I bought 4 brand new ones around 2003, can't remember where from, but was from a shop online 4.99 each. I think rupture? or ruption? used to sell a version too around the same time. Some of the capping was quite straight and one was more curved like the RL but all 4jeri.
had a look back and found 2 pics of the 4jeris on bikes, you can see the inconsistency of the forward overhang on the 2 below but both bought new at the same time.