I think it would have just been different makers like you said Jack, mine are very similar, just not as complex looking as yours, might just be the lighting in your pic too. But at least mine has the metal wheels it needs and it will soon have the correct numbers, and I will slowly add model 1 parts to keep it a cross over (it is using later donor parts at the moment).
I also note the green book says the Rotomo uses the Cigar tap, that would be late Model 2 wouldn't it? I have a Cigar tap here but its missing the slide, spewing!
Cheers everyone!