... I have always thought, as per most references I have seen, that the cuphilt was a form which did not begin as such much before about 1640...
You may go further back a little, Jim . The earliest cuphilt detected with its date inscribed on the blade, is a splendid example signed by HORTUÑO DE AGUIRRE (Toledo) in 1604. It is kept in the Armería Real de Madrid and was property of King Felipe III.