I think the USRSA DB start at '97 production models, was the PT630 still a retail model back then?
From the TW Racquet Finder below for the PT280. However on my PT630 with full caps, static weight is 12.4 and the swingweight is closer to 340...
Head Pro Tour 280
Head size: 97 sq. in. / 626 sq. cm. Balance: 6pts Head Light
Length: 27 inches / 69 cm Swingweight: 327
Weight: 12oz / 340g Stiffness: 58 (0-100)
Power Level: Low Construction: 20 mm Constant Beam
Swing Speed: Fast String Pattern: 18 Mains / 20 Crosses
Composition: High Twaron and Graphite