Yes, indeed early spoon. Town mark of Hoorn used during 17th century, year letter R for 1680, 2nd standard silver or "kleine keur" (833/00) hence the absent of the Dutch Lion. Maker's mark appears to be an axe and unidentified, Hoorn 1660-........
Source Citroen.
NB if 1600.... is not exactly correct time period, the year letter R could be for 1647 and 1st standard silver (934/000)
Peter.