The bit is designed for a bulleted keyhole - a common European practice. Once through the keyhole the bit just turns one way, like any basic warded lock. Although complex-looking, this is not too difficult a bit to make, though it involves careful drilling, sawing, and filing. And the keyhole likewise.
French? Italian? German/Austrian?
However, it quite possibly isn’t a functional key, but a decorative ‘chamberlain key’ - symbolic, acting as a badge or pass to royal or other official apartments. Many were more elaborately decorated, and eventually, the actual bit even disappeared, leaving the stem and a decorative bow.
This looks like a fairly basic key for a more minor official, probably 18C, though difficult to be certain with a simple style which could come from a long period and wide geographical area. There are certainly numerous keys reminiscent of this one, though I’ve not seen an exact match.
Or it could be a functional key. If so, it’s unnecessarily long for a chest, but many earlier door rim latches were only operated by key from the outside, so that is a possibility.
