Zamac heads

[VerbaVolant]

I've got a bunch of loose spare parts, including 2 caps. Both caps have the acid etched Gillett logo. Are they brass or Zamak?? I can't tell just by looking at them.

Only a file could tell. Or a hacksaw. Whatever is available to you. Heck, a Dremel will do. And since I don't have access to emojis, here is the transcript: LOL.