Hi James, welcome to the forum.
Sucket fork; small metal utensil used for eating sweetmeats, or sucket, with a two- or three-pronged fork at one end of the handle and a spoon bowl, usually of teaspoon size, at the other.
A very rare folding "sucket four-pronged fork" and spoon, sucket fork or succade fork made by a good and known silversmith with maker's mark
B for: Cornelis Bormeester, active 1730-1785, born in 1708- died 1785. Maker of small silver work, engraved small forks, signet, wax seal/stamp, became apprentice in 1722. The town mark Amsterdam, for small items, without year letter used 1718-1734. The absence of a year letter is not unusual for small silver items, light in weight, 2nd standard silver and made prior 1735. The crowned O and hatchet are later added tax marks.
The folding fork and spoon, unfolded length 12.5 cm, the width of the fork is 1 cm and the maximum width of the spoon is 2 cm.




For more information about those tax marks see:
http://www.925-1000.com/forum/viewtopic.php?f=5&t=32028Best,
Peter
Gratitude; D. Dekker