Hi,
Herewith I partly answer my own question. It was not uncommon to have the marks punched on the spoon bowl. Please compare the marks of an Enkhuizen spoon and Amsterdam with the smirched odd looking marks on your spoon. We also know that during the end of the 19th century plenty of replicas were made for the British market.
Those replicas were much better made than the one offered today at eBay.
A Dutch silver gilt spoon.
Made in Enkhuizen, 1751.
Length 7.5" (19cm). Weight 1.89 Troy oz (59gr)
Meesterteken Jacobus van Resant, Amsterdam, jaarletter 1724
Kind regards,
Oel