Hull Number Decoding

[ScottM]

EggSuckinDog,
scothawk55 is correct, it's the 6th boat of that model line built that year.

stoney,
No idea what the foil stamp is. Your HIN should be on the upper righthand corner of your transom.

WWP2,
Yes, you have a '78 23' Superfisherman. The model designation doesn't delineate between OB or I/O. You're missing 1 digit in the HIN, it should be 12 characters long.
SEC - SeaCraft
F3 - 23' Superfisherman (CC)
06X - hull # (you're missing a number)
04 - April
78 - 1978