This is incredible!! What a found, that Reverso looks very unique for this numerals. And definitely looks older than the 90's.. so maybe it’s a trial version (you mentioned one of the dials is not working), who knows? I think you should contact JLC as soon as possible tho get more info about this piece. Congrats!!!
Incredible watch, the SBGW231 has been part of my list of “future watches” for a while. I’ve tried it on and wears amazing, but my only negative point is the servicing.. you must ship the watch to Japan and that takes a while..
I’ve been thinking about getting exactly that same watch. I went to the AD and tried it on, it wears amazing. But I have exactly the same concern as you, it will be a scratch magnet for sure.
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