Hi Gary, great find. Nice caster and mustard pot however not made by Abraham du Castel ( Abraham de Kasteel) but I believe made by Jacobus du Castel. Both items made/assayed in different years.
Abraham du Castel registered in s'Hertogenbosch 3-9-1685-died 27-7-1713. His maker's mark being a castle with three towers with one gate in an oval shield.
Jacobus du Castel registered in s'Hertogenbosch 7-4-1711 died 4-1-1757 and his maker's mark being a castle with three towers and three gates in circular shield. See below:
The s'Hertogenbosch town mark (forest tree) uncrowned perhaps for 2nd standard silver and clearly for midth 18th century used 1735-1757 and in combination with year letter K crowned for 1734-1735 and the maker's mark of Jacobus du Castel.
The other item;
The s'Hertogenbosch town mark crowned used 1723 till 1735 in combination with the year letter H ( Gothic style) crowned used 1732-1733 and the maker's mark of Jacobus du Castel (upside down).