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You might be thinking of the DW-5600E. It’s like the M5610 but without solar charging or the multi-band 6 radio sync. I much prefer the 5610 for those reasons but there are many more variants and colours of the non-solar 5600.
There is also the GW-B5600 line which is the “upgraded” 5600 that has Bluetooth along with solar and radio sync. This is the line that the metal cased models (GMW-B5000) are based on. Most of these are reversed LCD but currently there is a positive LCD version in a resin case in the range, the GW-B5600MG-1ER:
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It's the GW-5000U-1JF I'm thinking of.
(or more accurately whatever it was called before the LED upgrade because I'm not dropping $300 on something with a brighter light)
That's what I'm thinking. I saw a almost all black one, but with a +ive LCD, that I liked just need to dig up the ref number. Or just buy the standard one off ebay to try it out.