Model Numbers

A1858 (38mm GPS)

A1859 (42mm GPS)

A1860 (38mm GPS + Cellular)

A1861 (42mm GPS + Cellular)

Apple introduced a red dot on the Digital Crown if a GPS + Cellular model.

GPS-only models: the back cover is composite, with 'Composite Back' and 'Series 3' written on it.

GPS + Cellular models: the back cover is ceramic, with 'Ceramic Back' and 'Series 3' written on it.