Call me cynical, but maybe the bean counters at Portamig Towers have worked out it's cheaper to buy more 12 position switches than 12 and 9 position. Cheaper to build + more money for an extra feature = more profit!
With a 12 position switch wouldn't you have 3 extra wires going into the transformer so that must be different too or am I talking out of my @rse?
The new Portamig is a completely different animal, but I still have nightmares from those days
The last few Ive sold were 211's but I've now started asking for them with smoothing capacitors