Okay, this is what I gave to USCIS during my 485 filings. My Dad made this from the local ward office and this was on Kathmandu Metropolitan City office letter pad with city rubber stamp and ward admin name and signature.
Note that I went through the new interview process and my interviewing officer read it and was okay with it.

To Whom it may concern

Sub: Birth Certificate

This is to Certify that Mr. (Your Full Name), Son of (Father and Mom Full Name), permanent resident of Kathmandu ward # was born on (Full Date of Birth) Kathmandu Nepal.

Admin name
Title,
and signature.