Hi guys, Her Majesty the 26th has round knobs. I'm sure I can confirm rounded knobs with the other early cars. Evidently, it was quite fashionable to have rounded knobs in the early days! The part number discrepancy between Mark's piece and Alan's description list is so typical Datsun. I am not surprised. It can easily be surmised that specific parts did not appear in an orderly progression of production numbers and dates / models. However it is quite evident that the squared knobs appeared later and replaced the original production of the rounded type. So many bits of the very early cars are unique, one might suggest that the first productions were of limited quantity and that the second orders for these parts were made with slight modifications. Perhaps the result of a comment made during a press release coctail party! In my opinion, the hand throttle is so unique that any knob shape is an interesting detail for a car. The knobs, like many other interior components, were made with a plastic that resembles "Bakelite", an older composition material. The only glue that will work to repair this material is "Superglue".