You might need a newer kernel or xf86-input-wacom. "lsusb" will show what product ID your tablet has, it might be more useful than the name for this. dmesg and /var/log/Xorg.0.log should show what is detected, there might be a different problem.
(Mine is CTH-460K, thought it was CTH-460 which was supported earlier.) The tablet works as mouse if xf86-input-wacom isn't configured/supported for it (evdev supports it otherwise) or if you configure it for relative movement.
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