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They are water activated “stickers” basically. You slide them off their backing, and onto the spot where you want them to stick. They are used on plastic scale models for intricate logos and the like.
What are "water slide" decals teecrooz, I don't believe I'm familiar? And Same here scarf man. It will be a long ways off if I ever even do a vintage myself. The roman's properly weathered looks amazing. But the transistors just need a little TLC.
I think a stamp would be much more accurate, although possibly harder to distribute to the masses.
Hmm, I actually have a device that can print this sort rubber stamps that you then dip in ink and apply. Not sure if it will work well for something that small, but I can give it a try when I have some time.Someone could 3D print a round stamp face the correct size out of something like ninjaflex with a 3D printed plastic handle, and once mailed the recipient could supply their own black ink pad to 'stamp' the top of a transistor.
The real ones are silk-screened, I believe, via roller process on the assembly line.
RbreplicasStore sells a pair together with the washers that are very close if not exact match size wise to my DAT11s. However, they are machined from stainless steel, so are a bit too shiny out of the box.
They all look great! The first on the left looks close I think though. I’d scale some for Romans especially though as that’s what the majority of people have, along with motorola.