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Yes! And here is a better picture! Top one is the concave!

The second picture are framebacks. The first picture is what they used to call concave grinds but people call them framebacks, or faux framebacks if you prefer! I have also heard them called rattlers!

It would be the opposite of what you state! This is how I understand it!

There is a frameback club known as "The Frameback Fanciers"! It just got off the ground today!

I believe you have this backwards The solid ones came first, around 1850 or so! The two piece variety...