We found a listing from a reliable source for three upcoming GWC-H1000C models. The suffixes are the same as the three international launch models, and the full names are the GSW-H1000C-1, GSW-H1000C-1A, GSW-H1000C-1A4.
It is unlikely that these are entirely new colorways, and we believe that these may be the same colors as the debut models but with a composite band. Another recent “C” model is the Frogman GWF-A1000C-1A, which has a composite band. If these new GSW-H1000C models have a composite band, that is likely the only upgrade, as a sapphire glass upgrade would probably include “S” in the name (like the WSD-F30SC). We’re not certain that these models will have a composite band, because it would seem more likely to release just one such model, and will the GSW-H1000C-1A4 have a red composite band? Also, we don’t know if these models are planned for a wide release.
(A composite band is the traditional hard link style of watch strap with a folding clasp. The name refers to how the band is made of resin and stainless steel parts.)
The release date of these GSW-H1000C watches is unknown, but they should be here by the end of the year. The GSW-H1000 is the first G-Shock smartwatch with Wear OS and a dual-layer color touchscreen.
Update: A reader commented that the GSW-H1000C models are China-only versions, but our listing source is from the U.S., and according to casio.com.cn, the debut models in China are the GSW-H1000-1MPR, GSW-H1000-1AMPR, and GSW-H1000-1A4MPR.
Photo of composite bands from the Gulfmaster GWN-Q1000MC series.