These are replacement cover parts for a Domus lock that i own. It is an old model, but a similar one exists made in INOX “http://domus.gr/en/inox-handles.phtml#0”. Through the years the plastic cover got yellow, so it had to be replaced.
I printed them with PETG for extra weather protection, although PLA would also work for indoor use.
The author marked this model as their own original creation.