Hello Major,
My advice is to be wary of this kind of thing. eBay doesn’t give you (or a specialist) the opportunity to sample and verify the kind of photographs you are talking about.
As for the marker pen, it is possible that the actual RK holder signed an old photo a few years down the line. OR someone is looking to make a quick buck out of the true enthusiast.
I would like to see some of your photographs if you’re willing to share and I think I speak for the forum as a whole saying this.
Best of luck,
![thumbsup :up:](./images/smilies/Icon_thumbsup.gif)
Fallschirmjäger - Nick M.