Mooneye (TicWatch E and Ticwatch S) are a pair of budget watches with plastic cases.
Mooneye are watches with OLED displays and GPS built in. They are obviously targetted at a more budget market with their plastic construction and MediaTek SOCs.
The watch has a hard plastic shell, with an angular design. Some variants come with translucent case elements. The straps can be replaced with any 20mm strap.
The top case is made out of hard plastic, while the strap is made of a softer plastic. The strap contains GPS antennae, so customising them isn't feasible, but they aren't integrated with the case, so they should be replaceable if damaged.
Both watches are held together with glue, so opening them will compromise water resistance. Parts are not commonly available.
Miscellaneous hardware docs
Manually getting to fastboot
During the first seconds of the boot process, swipe diagonally across the screen. Starting from the top/left outer edge of the screen to the bottom/right.