Received our rebuilt distributor from John Jenkins, the distributor part of 356 carburetor rescue, today. It’s (cast iron) heavy, looks like new, and was very well packaged.
The distributor I found on the engine was a Bosch 0 231 129 010, and appears to have been original equipment on 1959-1960 VW Type 2 (Bus). In the words of John “The 010 you have is really, really wrong for your engine.”
Regarding the details, I guess the hope of getting a date code correct distributor is probably a losing battle. Maybe inconsequential as once the case is blasted and painted, you’re unlikely to be able to read the date code anyhow.
Per John, assuming no one looks for the date code, the only differentiating thing would be the contact plate. Early BR18’s had smooth contact plates and later ones had dimples in the contact plate. The hardest item to get is the correct condenser. In 1961 it would have been one with a totally different part number and date code method, compared to the seventies on up. It would also have a yellow wire to the terminal.