The motor out of my other Super 24 is sitting on the workbench as I’ve started refurbishing it. I had a look for the engine number and it is also stamped on the front side of the crank case. So, perhaps with Super 24s around this era, they stamped the numbers on the front? It certainly makes reading it easier as that area is clearer of clutter on the Super 24 as their air cleaner assemblies are quite bulky on the right side of the engine.
The number is: 537214222
On the left side of the head is the raised number 4.
