Very interesting finds there Paddy. That Thunderbird ring reminds me of a thread that was going a few months ago in which certain members insisted that a Thunderbird and Arrows, stamped into a British coin, were actually symbols of the Nazis of WW II. It seems they thought that simply because the coin was believed to be stamped during the war. Several of us tried, but failed, to convince them these were symbolic of American Indians from the South West of the USA. Be that thread as it may, you still have an excellent haul.
Love following your treasure hunts. Being old enough to remember disco (but never a fan) I bet that Capricorn medallion dates to the mid 70's.
Ben the coin geek on you tube would be interested in the ring...OPC store/old pueblo coin in Tucson, AZ