As a 'casual' collector (of many kinds of things) most of the coins that have come my way have been 'modern' (i.e. 1970s and later). A friend who skipped the country to escape his creditors gave me his pile (he was a bi-polar hoarder) but it didn't contain anything that might have helped him pay off his debts... just modern stuff, some of them pretty though
However, if you look at what's offered by numismatists on ebay, you soon come to realise that in the old world there were some beautiful coins that you would never be likely to come across casually like this, or in the average thrift shop... like this old 10 centisimi coin from Italy
not valuable, just nice