The faces with lettering are part of the instrument so I believe the only way to buy completely stock new faces is to buy NOS instruments. There are some speedo and instrument shops that will restore or create completely new design faces Here is one example.
http://www.bobsspeedometer.com/1/120/custom_work.asp I don't remember if the 23rd series had any lettering on the actual glass but if so that might require a separate company and there are some that will do glass screen printing. Don't have any links for them though.
There are new
blank ID plates available you can letter or there is a fellow on
ebay that advertises the engraving service. On some models he may also have the complete new plate with engraving service.
I have not done business with either company so can't offer first hand experience or know if they do work internationally. Maybe a shop in Australia will offer a similar service.
Your car would have originally had a vacuum wiper motor. The knob on the column operated the motor if turned one direction and if turned the other direction would also start a windshield washer if the car was equipped with that option.
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