Hi,
We've got a few thousand Dells and don't have any models with that model number, so maybe it's a BIOS that hasn't been blown properly. This might happen if you get eval equipment from Dell in advance of product release. Is other inventory data coming in fine from it?
Try seeing if this odd model comes up from this SQL Query.
select distinct model from vHWComputerSystem
If it does, try tracing the machine by it's user in resource manager. Then you can call up the user (yeah not ideal) and then get the machine looked at...