I would find it better if if we could set that the search is just in face value/year/currency/label on the coin, and not included the text in the description. Because that gives too many results what is non-relevant. That gives different currency results, and totally different face value.
Example: I look for 5 baht of Thailand and I have 600 baht in the result for example, just because a 5 December date is mentioned as the ruler's birthday.
https://en.numista.com/catalogue/pieces187699.html
Or I want 5 forint of Hungary and there's 100 forint is results, just because the portrait on that is the same as on a version of 5 forint.
So an option would be good to add: Search in the description: yes/no
(Even search in features: yes/no, so I don't get coins as results that has the same diameter as the wanted face value)