Not gold, not chrome-plated. Brass. I've seem them on DBs of course, & recall seeing lots of brass parts(bridges, nuts)on 70s basses, particularly Alembics. I'm slowly amassing parts for a P-clone rebuild/mod project, and want all brass hardware. I just snagged an old Mighty Mite bridge & brass nuts are pretty common, but not so much on tuners. I'll go gold if I have to, but thought I'd tap the collective mind here first.