There definitely were 5-speed 1200s. They were the GX-5 model, sold in Japan and possibly other asian markets. Datsun Competition also sold the gearboxes directly.

The 1200 5-speed looks just like the 4-speed, very small with lots of ribs all around. Not smooth like the newer 5-speeds. Grab one if you find it.

I was speaking to a couple of guys over the weekend. The word has it that there are a few 5 speed transmissions around used in some of the 1200s that were imported many years ago (to Papua New Guinea), I'll be having a look around over the next week or so to confirm the tale. Can anyone justify this?? It sounds like it could possibly be true. I'll grab one for you JH if I find em?

Chris