I had a Wolber Aspin rim that I recently sole to somebody on another list. I seem to remember that mine was dark anodized with eyelets, box section (like a Mavic MA2), and was a clincher rim. Sorry I cannot look at it to confirm, but I am positive that it was not a sewup rim.
Seems like Wolber may have used this name for a variety of rims.
Jason Cloutier Pawtucket, RI