It's my understanding that it's really tough to tell. Titleist has driver with serials, without serials and with serials that are unique that are Tour offerings, retail offerings and custom offerings. So really, it could be Tour, it could be retail and it could be just a custom offering.
A good indication would be the shaft. If it's something prototype or Tour issue, that would be a good giveaway.
So really, unless Ernie gave it to you while drunk off his ass, you're pretty much up shit creek.

Good luck, and welcome aboard Shot Talk!
R35
Callaway FT-9 Tour N 8.5* Matrix Ozik F6M2
Tour Edge Exotics 13* Accuflex Evolution
Adams PNT Tour 17* Matrix Altus HB
Adams PNT Tour Proto 20* Matrix Altus HB
Nakashima NP-1 Tour Forged 4-PW FST Pro 115
Nakashima NP-1 Tour Forged 56* and 60* FST Pro 115
Callaway Tour TT2 Raw Ace Of Clubs Edition Nippon Pro Heavy
TLT'd
Alternates
Cleveland Launcher Steel 19* Accuflex Evolution
Odyssey White Hot #2 TL Edition Nippon Pro Heavy
Too many churches and not enough truth...
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