Hey Ton, I will have to review this when I get back home from work. Randy Schoenberg did a lot of editing for this profile over the past few days.
This link gives access to the prenuptial agreement between Isaac da Fonseca and Raquel de la Parra. It has his signature, but also that of his father, so you may compare his signature with the one under his marriage ban form 1669. There are slight differences, but there is also the gap of 35 years to consider. All in all, I think it's the same man that signs in 1669, and in 1705. https://archief.amsterdam/inventarissen/inventaris/5075.nl.html#NOT...
Abraham da Fonseca alias Alvaro da Fonseca, alias Jeronimo da Fonseca, alias Jacques da Fonseca makes his last will on 19 August 1710 before notary Van der Groe in Amsterdam. Children: Isaack da Fonseca, Angela wife of Isaack Pereira Belmonte, Debora wife of Joseph Pereira, Aron da Fonseca, Daniel da Fonseca, Sara wife of Abraham son of David Franco Mendes, Jacob da Fonseca, Hana da Fonseca, Salomon da Fonseca.
https://archief.amsterdam/inventarissen/inventaris/5075.nl.html#A25...