feinblechbearbeitung is a therm for thin materials from 0.50 to 3 mm alu, Rostfrei, copper.... High polished mirror like, brush polished ect. Some time gold plated but never had the appointment to work with some.
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Yeah, I know what Blech is 😅
'Goldenes Handwerk' is just a saying; It means that those who develop a manufacturing skill, like... Feinwerkmechaniker... or smith, you can always make a good living and sleep well.