Watch List notes:

COINS, WEST INDIES, BRITISH GUIANA William IV (1830-1837), Silver 1/8-Guilders (2), 1832, 1835 (Pr 26, 27; KM 16). Both frosty extremely fine with some toning, a few light handling marks on the 1832. (2)
Both ex Wheeler collection.
I am having serious doubts that these are known in mint state.

Estimate: £150-200