"Tropical" is an interesting term in the watch biz. I have been following this term through its evolution over a long period of time. I think it probably started out having the meaning that a dial had been subjected to sunlight and was either faded or had changed color a bit....Mainly a dial had become somewhat warmer in color. This could be a black dial turning a bit brown or a white or silver dial taking on a tan hue. It's all dial damage but some of it to some collectors is attractive.
As this "tropical" thing became desirable or valuable, the definition of the term expanded. Water or humidity damage became "tropical." All sorts of damage came under the "tropical" definition.
I am just a follower of the definition. I am cool with whatever people want to make it. That said, I think some environmentally caused dial changes are beautiful and some are ugly and there is a lot of in-between. I guess it's a matter of taste and we all have to make our own judgements.
HI, THANKS REPLY, VERY INTRESTING INDEED, THINK I WIL LEAVE IT ALONE , AS REFINISHED DIALS ALWAYS LOOK , TO ME ANYWAY, REFINISHED, NO WHERE AS GOOD AS ORIGINAL. OF COURSE IT MAY DEPEND ON THE REFINISNERS SKILLS.