The 32K Tandy Color Computer 2 model 26-3134B. This particular system has 16K with an extra 16Kb extended RAM. The 3134B model had an upgraded video compared with the Coco I and earlier CoCo II's.
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The later Coco 2's like this one have the newer "Tandy" nameplate. The earlier CoCo 2 models still had "RadioShack" in their name.