I just got an old Garmin Edge 520. It seems to work absolutely fine other than it does not connect to my iPhone 13 Pro. My iOS is 15.5 and Garmin firmare
Garmin Edge 520 のバッテリー交換 | Essays in idleness
010-01368-00 Garmin Edge 520 Cycling GPS Computer With Bluetooth Compatible with Android and iPhone
GARMIN (IT) | Ciclocomputer GPS cartografico | Edge® 520 Plus