Phyllis brought a third chip into the thread when she brought in the Campiglia/Wells book.

Your picture has TCR #N7864 (city on chip), and either N2272 or V9912 (yes, Bryan, that was a new listing in TCR #9)

Hopefully Allan will be along to tell us if Bryan is right in his thought that the difference between #N2272 and #N9913 is the shade of the inlay.

We have #N4474 (the 4th $1 off-white chip listed in TRC for the Trop, it has the diamond logo) AND another one with "the same" inlay, but the colors in one inlay are lighter than the other one. I don't think it's from fading/use/cleaning. I think there was a reorder and the colors are a little different.