Duo Lingo Calendar is build from several parts.
The clock faces are fixed covers and holders. After assembly the covers need to be glued together.
On the bottom you have also holder for the paper sticker.
It is nice calendar and can be a nice gift for the kids or teachers for keeping track of day, month and weekday.
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Update Jan-2024
New improved version is here. The readability is improved, therefore also the largest ring is for days and middle one for mounts.
The author marked this model as their own original creation.