First let me welcome you to the site, its always great to hear about new members. With that out of the way, these look pretty cool and I'm interested in hearing if anyone can help. I'm can't be of any help but maybe someone on here can. I'm not sure who the Tennis guru's are on here when it comes to collecting but if anyone does know, maybe then can ask them for assistance.
I do have a question that could help though, what size are these? That might help a bit in pinpointing where these might have originated from. Beyond that, if nothing else, I hope this bumped the page so others can see it, and hope someone can help. I also hope you enjoy the site.
Royal Card Review is my blog if you feel like checking it out, thanks if you do!- royalcardreview.blogspot.com/
In the process of updating my collection so don't trust any of my lists right now.