A set of Mini Clocks was released by Movic.
Each has a retail value of 840円 ($11.20).
They don't appear often enough for an average second hand value, but some have been seen around 1000円 ($13.33). This makes them one of the few non-limited items worth more than their retail.
Each mini clock measures 6cm x 4cm, and comes packaged in a small, paper box.