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cas3,
No serrations and no lock washers built in with binding head screws (and they weren't used with separate lock washers in the two subject locations on the sides of the dash). The heads are flat on top as shown.
Truss head screws were also used to attach the glove box to the dash so maybe you won't have to buy quite so many old Fords to use up your screws.
As for Roy's business, I think it is a bit premature to expect an answer as to its future.