Hapco Marine Mk 1
Boat Number Range: 5449-5459, 5472-5479, 5900-5909, 5925-5934, few others up to 5968
I think these boats were built off the Annapolis tooling or a modified version of the Annapolis tooling and as such, have many similarities to the Annapolis boats.
These boats had tall and very square seat tanks with wood thwart that had very little overlap on seat. Half height bow tank (same as seat tanks) with a full height bulkhead in the forward part of bow. Not the distinctive roll to the aft 2 feet of the seat tanks.