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Drivetrain WTF!
Yeah - good luck with figuring that out! 
From here: http://bikehugger.com/2009/03/mystery-portuguese...
And here: http://bttdominhoaovouga.blogspot.com/ Spoilers in the comments - don't read this if you want to guess what it is
P.S. My guess is the hub has a sliding mechanism inside whereby it's driven by either the large cog or small cog, providing two speed shifting at the rear (and two at the front, for four speed overall).
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imagine putting the power link on that lot during a race
....new single speed now with reverse!
or, If you pedal forward its high gear, pedal reverse its low gear???? (just reverse the teeth of the cogs in the hubb????)
See what you have done Rob, I,m starting to think....you know Im no good at that!
Pikey
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The Liver is Evil and must be punished
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The two rear sprockets would be rotating in different directions, the smaller clockwise and the larger anti.
I'm pretty sure it's an early back pedal brake system.
From bablefish "Esta é a tal, que tanto se pode pedalar para a frente como para trás. Genial!!" = "This and to so, that as much it is pruned to pedalar for a in front like stops after. Brilliant!"
Obvious really.
How much hassle would it be to remove and replace the rear wheel - I hope he's running tubeless
Now that is a very complicated way to build a two speed bike.
As the bike grows older it will get longer. and it will grow into its chain.
....is it Rohloff?