A known and an Unknown Eagle

Do you remember the two eagles that passed right over my head?
Well, I was able to read all 4 digits of the identification ring and I received the response from the Swedish Bird Identification Center (Ringmärkningscentralen).
It is a male specimen, nr. 6227, born on 2015-05-10 (the place is kept secret for security reasons) from a brood of two specimens.
For hhe other one, unfortunately, I could not read all the numbers, but starting by 4 it would seem that is much older.

The one that instead, lately, has passed over me at decidedly higher altitudes, has no ring and therefore the doubt arises: from where this specimen is coming from?