never seen that type of stem before
I'm still trying to figure out who made this one, well made stem.
The stem was made by Oxcart Industries back in the early 1990's. Me and my brother made the parts only for one year and we had eight different models. This is the first time I have actively searched on line for the parts so it was good to find a picture of one. I still have one of each model and can post pictures if anyone is interested.