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Click on the pic to see larger version, shows red arrow that points to the tag. If the drive is tilted UP, you probably can't see it.
If it is original to the boat it should be a 280 or 290.
The DP-A came after the 290's, as Maclin stated. The progression is DP-A, DP-A1, DP-A2, DP-B, DP-B1, DP-C, DP-C1, DP-D, DP-D1 & DP-E
the single props were SP-A, SP-A1, SP-A2, SP-C & SP-E , that is all you need to identify those drives, no number in front of it. You won't find any of these labeled "290" . It gets confusing, the 290A-DP and 290-DP are not the same as DP-A .