Antique Badges
Badges have been popular for a long time. They provide a means of identification for pl=olice, fire and others. Over time, as styles change the old ones become more valuable. Ebay, as the worlds largest venue for these kind of things has lots to offer.
If you have an old badge and are trying to figure out if it is worth anything you can search Ebay and try to find an identical or similiar item in the completed sales category. If yo find it there you can be reasonably sure of its cash value.
If you aren't sure of what you have Ebay can help you with identification. Even if you can't find the exact badge, you can probably get a good idea of what items like yours sell for. You can also see what the key words are which buyers use to find the badges they are looking for.
Finally, if you are knowledgeable about badges I suspect the many clueless sellers provide an endless opportunity to buy cheap. You can build your collection and/or accumulate in ventory for resale.
Below is a list of badges currently for sale on Ebay. Take a look as see if you can find something interesting.