How did they achieve the labeling on this wood-cased preamp?

Where'd they get the combo AE then? Never seen a transfer like that one.
It´s a Latin letter very much alive in certain languages, so not surprisingly at least some transfers must include it:
https://en.wikipedia.org/wiki/Æ

As of that homemade looking preamp case, the sparsity of lettering suggests hand applied transfers, later varnish sprayed on, but of course it might be silkscreening ... in which case I would expect more elaborate graphics.

FWIW transfers are created by silkscreening a special ink on transparent/translucent sheet and then sprayed with contact adhesive.
 
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Guitar amp panels here, up to 6 channel mixers .... now that was A LOT of work.

Which was good, because it made me learn Silkscreening.

Yet the Silkscreen artwork original, on Vellum paper ready to be burned on screen, was still made with Letraset.