Seems like it's something wrong with my posts, did my poor english annoying you? There is no problem, just inform me to see what can i do about.
There is no way to hide a decal in such a fine surface. Been honest, the only way to "hide" a decal is to be created to cover the dial complete.
Then you will have the final surface "finnished" accordind the type of clear decal that you choose (glossy, matte or satin).
The apply of decal will be as much difficult as any other method but you will not have the option to correct its' placing because it will might destroy the other silk prints.
There are some other "waterslide" decals that you can use but you need the same procedure to print white (with coverage) on them like if you print the dial alone.
Also you will need to "finish" them with clear coat or bake them...
I can't suggest you those ways cause their result, if you manage to achieve the best of them, will have far less quality than the gens' silk or enamel printing.
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There are two kind of printers that can help you printing white on dial, best with flatbed printers and some large format printers that have roll feeding and you will
work a lot to achieve any kind of stable register (centering) on them.
With a flatbed will be less than an hour to achive the right possition and the result will be very close (99%) of the gen while it will be strong with the same durability
as silk printing against the sun or an excess of lubricant.
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Have a look on youtube about silk printing at home. It's the easiest method, very low cost against any other method and your final result will be just like the gen.
Just don't try to make a silk page on your own, its fine for a tshirt but you need accurancy and it's better to have a pack of 10 for a couple of $ at your nearest
hobby store etc.
It's also very easy to make a small jig for the silk printing that will allow you to handle small "production" if anyone here wants to have a dial like that.