Hey Chris, is it a mini stem? 1" threaded clamp on?
If so, I've seen the ESP ones which are very similar, may have been made by the same company.
![](http://www.radbmx.co.uk/archive/albums/vv209/steve69-pics/null_zpsc4fced4d.jpg)
Hey Steve, yes its a mini stem, well I have it on a midi/expert JMC.
Its an odd clamp, you have to experiment with washers to get it on right - if you just thread it all the way to the top cup there is no guarantee that it will align with the forks. Once you've got the washers right so the stem is facing forward you then use the allen bolt to hold it in place.
Thankfully mine came with a plastic cup which fits inside the forks otherwise they could slowly fill up with crud if you left a hole in the top...