Maybe Auburn Brass? That type of stem is cut to length and yours looks like it was cut. The original length may have been longer.
I'll look more later.
http://www.centralcomponents.com/cart.php?m=product_custom_list&customListIds=1|12,&customListId[1]=12
I saw exactly that right away as "Ceramic Auburn Brass 16 pt.", it's right there on page 166 on that pdf file I posted. Kissler makes a pretty good bible with their color photos of parts.This one looks almost exactly like the one you have:
This is awkward, but...
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