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There is original Carta, Carta 1200, Carta 1250, Carta 1300.
The original Carta may have been renamed.
Pearl was the biggest incremental change and original Carta the 2nd biggest. Mobius is now of little value as the readers use ribbed rear flat front alloy plates for the screen. Some ereaders had a cutout for the LiPoly cell (battery) and then when it swelled the screen substrate cracked, such as Story Cover.
The mobius was intended for large screens where the ereader might flex. Likely the yield and lifetime is lower, as that's the case with flexible OLED.
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