Well, I put a drop of 10K acid on the middle coin, in a area where it is clean metal. Sat there about 6 seconds and nothing, then started bubbling a little, left a light tarnish, a delayed reaction! So the results seems to indicate a low grade gold content. Maybe!
If you go and buy the book The Instant Coin Collector: Everything You Need to Know to Get Started Now by Arlyn G. Sieber you will find it on page 230: Chapter 26
The title of it in the book is "Braided Hair"
The date is 1840-1857
The designer is Christian Gobrecht
It is 100% copper and the value is $40.00-$80.00
Diameter 27.5 and weight is 10.89 oz.