Unusual U-24 on eBay

[Dr. Strangelove]

An unusual U-24 has shown up on eBay, that does not have the markings and logos that the standard "Pioneer" logo, or the "Series 20" logo.

Is anyone familiar with this U-24 and its markings?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5738307332