How do I get a few Air Mail Stamps holdered ?

MFH

Good evening.

Thirty five years ago, I was very active collecting U.S. stamps.
I ended up selling off the better ones - but recently, I bought a
set of Air Mail stamps [ C 1 thru C 6 ] all VF/XF OG NH.

I'd like to get these stamps holdered by CU's Philatelic Division
but am unfamiliar on how to do this.

Could some one provide a link ?

Many thanks.

SCDHunter

Here is a link to their services and fees page.

PSE Link

MFH

Thanks !!

I requested a submission package.
I'll post grades once I get them.