I've seen these old bridle rosettes in antique stores for quite some time. These are traditional decoration on bridles for driving horses. They became in vogue during the Victorian era, the 1880's. Companies even used them for advertising, even for Presidential candidates. Production ceased in the 1950's but came around again in the 1990's. People now use them in jewelry. I recently bought a pair in good condition. I will use one as a belt buckle and the other as jewelry, having it made into a "slide" to go with a gold necklace I already own.
You can find them on Ebay and prices vary tremendously:
This is on Ebay right now as well, interesting how the rosettes were sold.
The set I bought looks like this but the gold is in better condition:
Here is one made into a lovely necklace.