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Here's a test of making a mold to copy an appliqué. I decided to try it on an appliqué on a Majestic 71 radio. It's about 1" long. The radio was refinished by the previous owner and that might account the the old finish around the piece.
I mixed up Equinox 35, which is a silicone putty and applied it. I removed it after letting it sit for the demold time of 7 minutes. I was surprised to see that no air was trapped.
I then mixed up some Bix staining putty and used that to copy the piece. The rough surface is due to micro bubbles that I didn't realize had formed when I added the water and mixed up the putty. If I use this in the future I will need to degas it. Otherwise I might use an epoxy instead.
The final photo shows the part next to the original after spraying with lacquer. The difference in color is because I only had mahogany toned lacquer when the original is walnut.
The rough surface is unacceptable so I will need to work on this some more, but the mold was easy to make and is more than satisfactory.
John
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