What's the plural form of pinchbeck? Here's the word you're looking for.
Answer
The noun pinchbeck can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be pinchbeck.
However, in more specific contexts, the plural form can also be pinchbecks e.g. in reference to various types of pinchbecks
or a collection of pinchbecks.