Hungarian to English Law/Patents Law (general)

This abbreviation appears in the name below the signature of a document issued by a kerületi biróság, after the name of the judge and before the term "biró".

As in: Dr. X Y sk.
biró

"Biró" is on the line below, as indicated here, but it could simply be because the previous line with the name etc. was too long.

Does this mean simply "sajátkezüleg" or does it refer to a type of judge? Thanks for your advice.