As you've discovered, raw brass hardware is not nearly as common as lacquered as it can tarnish during shipment and while on the shelf waiting to be sold. Any fingerprints on the brass from manufacturing or packaging can be points where oxidation can first occur. Fully clean and buffed raw brass will sell, fully tarnished raw brass will sell, but mottled partially tarnished brass? Not so much. But you can search for it by looking for "living finish brass".

It's quite easy to strip lacquered brass. Soak it in an acetone (nail polish remover) bath for a few minutes, then lightly scrub with steel or brass wool. Don't use a plastic scrubby, the acetone may dissolve the scrubby.

Found a place in the U.K.:

https://ahbrass.co.uk/door-furniture/hinges/shower-door-hinges-fittings