Re: Lettering Perspex?
Perhaps engraved from the rear and the depressions then back-filled with black paint ? Something similar was done for the Quad II amplifier serial number plate. The main design appears to have been moulded in, but the individual serial numbers must have been cut. Both were then filled with off-white paint and the whole lot backed with a second pale purple/beige layer. An engraving firm might advise.
Cheers,
GJ
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