Always love to welcome another Clemente rarities/oddball collector.
To answer your question - The "NY Friends of Clemente" fan club card is identical on the front to the relatively common "Daily Juice" fan club card and more difficult "Harmony dairy" fan club card. The "NY Friends..." example I own is the only one I have ever seen. I have been so far unable to find any additional information about it though would surmise there was some type of Clemente fan club in NY that the cards were made for (likely in very small quantities given that the one I own is the only I have seen).
There is an incredible world of Clemente rarities and oddball issues and I have found it both challenging and incredibly fun to pursue. I invite you to PM me or email me directly at
hcv123@att.net with any questions you have. I am happy to share my knowledge and experience.
Nicolo (Thank you) provided a link to my master set which you might enjoy and Michael provided a link to a FANTASTIC Net 54 Clemente thread which I highly encourage you to enjoy from beginning to end.