You're doing a grand job.
Found these in 'General Dynamics Aircraft and their predecessors' by John Wegg, Putnam 1990:
Seadarts #1, #2 and #3:
- 1/14/52 Convair XF2Y-1 (BuA 137634) E.D. 'Sam' Shannon takes it up for an inadvertent hop during taxi-ing trials
- 4/9/53 'official' first flight, same pilot?
- ?/?/54 (spring?) Convair YF2Y-1 (BuA 135762) Charles E. 'Chuck' Richbourg
- 3/4/55 Convair YF2Y-1 (BuA 135763) B.J. Long
Pogo:
8/1/54 Convair XFY-1 (BuA 138649) James F. 'Skeets' Coleman, first untethered flight