Hi Joho,
Dutch apostle spoon and with original marks; the Amsterdam city mark, on your spoon; for the 9th alphabet used as of 1663, exactly like it should be. The province standard mark(mal-formed); the left over of the crowned shield is exactly as it should be for this particular time period. Your date letter mal-formed;
C,
e or perhaps
G for 1665, 1667 or 1669
To top it all off, I believe we found the maker’s name being; Cornelis Meyer, a small worker specialized in cast spoons and also jeweler, registered in Amsterdam from 1645 till his dead in 1708. Cornelis Meyer’s mark being a stylistic lion.
Your mark mal-formed:
Cornelis Meyer’s mark:
In short, I believe we are looking at a Dutch Apostle Spoon St. Phillip; a staff.
Engraving; The Chi-Rho emblem can be viewed as the first Christian Cross. As a pre-Christian symbol, the Chi-ro signified good fortune.
Congratulations very nice find,
Oel.