For my current Mimeo project I have been attempting to find vintage parts. Some are just un-obtainable. While I could spend a ton of time and money tracking down the LM323k with a Gold base, finding the correct date code and more importantly the early National Semiconductor logo would be nearly impossible. National Semiconductor has had a few logos since it's founding and the Apple-I regulator uses the earliest one dating back to the 60's.
For the Apple-I/Mimeo what was required was a recreation of the National Semiconductor LM323k with 24k gold base.
The core for this process is an actual NS LM323k, but of a more recent vintage in Steel.
The base was cleaned using 000 steel wool. The original date and National logo were removed using 2000 grit wet sand paper.
I used a disposable "penny" pen 24k electroplating system that is good for about an hour worth of plating. The 24k gold solution should be good for about 3 months before it expires, so I may make a few more for some friends
The final logo/labeling artwork was created by my 11 year old son and viewing a close up picture sent to me by an Apple I owner.
The logo was transferred using "wax" hard surface laser paper and an iron. It took a few attempts to get a clean transfer. After each failed attempt I removed the logo with 2000 grit wet sand paper and let it cool before trying again.
After each transfer, successful or not, I would test the LM323k using a breadboard, a 9v battery, a couple of capacitors and a volt meter.
This is my final result...