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For Dingbat for steampunk purposes.
0.35mm brass sheet, hammers, Brass Black patina.
Process - first, a Polymorph master with paper tape for antistick:
Pressed into another blob of Polymorph to make a matching female:
With a flange to screw the sheet to:
Sink it most of the way with hammers:
And tidy up the shape with the master:
After that, hold the master in the vice, and use it as a stake to texture the brass on.
That master proved too pointy, so I remade it with a shallower angle for the final product.