The one signed by Obama in the link you posted is definitely an autopened signature.

I was actually going through my grandparents things as well and I found a very similar letter with the signature of Richard Nixon at the bottom. The signature was preprinted though; I found one on ebay which matched exactly. I will try to put a scan of mine up soon.

My guess is that yours has a preprinted signature as well.

Hello All,

I was going through some of my Grandparents stuff and came across a letter.
Offical White House envelope with letter honoring the memorie of a person for there service to the armed forces. A the bottom it is "signed" by President Reagan.
The "g' in Regan goes through the "s" is states. Which makes me think it is really signed. Does anyone know anything about these letters.

http://www.cem.va.gov/pmc.asp

loos just like this, but from Reagan.

Thanks!

Matt