Example how coins search can be used.
In case of search 'Russian Empire Nicholas II 1 ruble' it can be done in following way:
'ruble' is typed in search field - a lot of rubles are displayed.
then filter attributes are used to narrow the search result:
"Russian Emprire" is filtered.
"Nikolay II" is filtered.
"1" is filtered.
Few Nicholas II Rubles are displayed:
1 Stuiver Dutch Republic (1581 - 1795) Copper
Coin prices from public sources