I don't have all federal statutes at my house (I do have all the Illinois statutes-anno). I believe the copyright laws are part of Title 17, but here is the informal answer.

You aren't planning to act as an agent for the organization, nor are you planning to generate profit for the club. You are a member, and it is completely in order for you to say you are a member and to promote your specific collecting interests. The club even says you allowed to say your a member, just not to present yourself as acting for the club (only the board or its designate may do so).