Departmental Permission Certificate is Signed by the "Competent Authority", and first portion of the form is filled by the candidate and 2nd portion is filled by the Department where Your Domicile is confirmed in it as well and date of your Appt and Date of Birth etc.

The Departmental Permission Certificate is forwarded with a letter addressed to FPSC wherein Recommended or Not-Recommended for CE is written. Federal Public Service Commission will pin up your this certificate at the time of your Interview (if you reach to that level). No other documents are accompanied along with the certificate. You have to despatch them along with your application .

It is true that it passes through many desks from SO to DG or even Secretary etc.