Here is a recent example added to my collection.
I purchased a Gomez-C2-05 Eisenhower POTUS sGm (reverse is June 1960, 38.1 mm diameter)from a west coast collector. This collector speculated that it was owned by a US Government secret agent due to a note/sticker on the medal's holder. I never saw the holder (only the medal through images).
After I receiving the medal and its holder I started to do some investigation. The note/sticker indicated the following:
"Purchased by J.L. from Rufus Youngblood Secret Serv. Agent who threw himself in front of Johnson at Kennedy Assasination (sic)" A line is drawn below the above text. "Ike Presented to R.Y."
The only J.L. I know who deals with Presidental medals, coins, and tokens is Joseph Levine from Presidential Coin & Antique Company in Virginia.
I contacted Joseph Levine via email. I received a reply email confirming that the note is true. He purchased the medal directly from Rufus Youngblood. He also purchased several other medals from him.
I now own a medal with a partial provenance (incomplete chain of ownership link), but with a outstanding pedigree.
Provenance1. Bureau of the Mint to President Eisenhower
2. President Eisenhower to Rufus Youngblood
3. Rufus Youngblood to Joseph Levine
4. Joseph Levine to Owner 1
5. Owner 1 to Owner X
6. Multiple owners ?
7. West Coast Owner to DrDarryl
Pedigree1. Medal awarded from President Eisenhower to Rufus Youngblood (while he served on the White House security detail).
Lastly, Rufus Youngblood wrote a book (I recently order a copy to continue my research). Here is an excerpt.
http://jfk.hood.edu/Collection/Whit...tem%2065.pdf