Nice find on the pic, Cobrajet.
I remember back in the day when that style of rear seat pass-through was a status symbol in certain imported cars because you could take your skis to the slopes, secure inside the car. They were specifically marketed as ski pass-throughs. 60/40 folding seatbacks weren't on the scene yet.
Compared to a normal folding seat, though, it' not entirely useless, but mostly useless!!
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View my fuel log 2014 Mirage ES 1.2 manual: 62.4 mpg (US) ... 26.5 km/L ... 3.8 L/100 km ... 74.9 mpg (Imp)