Actually, they're not as heavy as you'd think
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I have needed to replace a couple of front sight blades recently and I was casting about for an appropriate material to work with. I ended up using £1 coins from the UK. The metal has a slight yellow/gold/brass appearance throughout. The coins were easy to work with and somehow look right to me. They also offer good visibility, especially against dark-colored targets.
Now, I’m not the craftsman that many here are, but the remaining marks and unfinished appearance seem to fit with the “old” guns. I also kept the original rim of the coin on the Henry sight, so it has a neat engraving pattern. That meant removing the sight and filing it from the base as I sighted it in, but it was worth the effort.
These may not be as “authentic” as a Cinco Pesos or something, but they have worked well for me.
CC Griff