On your SR52, is the USB port on the right side or left side if you are holding it with the switch up pointing away? It seems the production version has it on the left side so it doesn't bother your hand if you are right-handed while the ebay one is on the right. Minor issue. On the S20, they seem to be using the old white switch with the new XML2. These are the outward differences, but I can't speak to whether the internals have issues.
On my sr52 the USB connector is on the right when light pointing front and switch upwards.
So its a pre production?
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