2007 Fujitsu Lifebook T4220 running Windows XP Tablet PC Edition 2005 SP3 

While it may not be the first Tablet PC in my collection, it's the first one to be a Fujitsu. This was also an eBay purchase (alongside with the recovery media that I bought for it separately).
Specs:
Intel Core 2 Duo T7300
Intel 965 Express Chipset
1GB RAM
60GB HDD
Windows XP Tablet PC Edition 2005 SP3

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