Who made these? First one I have come across.

Diamond Calk Horseshoe
http://hoofcare.blogspot.com/2015/07/kerckhaert-acquires-diamond-brand-tools-horseshoes.html

That's ironic; it was only about two weeks ago we were talking about Neverslip pliers:


http://www.papawswrench.com/vboard/index.php?topic=20428

Made by the Neverslip Horseshoe Co. of New Brunswick, New Jersey. See Cope page 230.

 I have these two.

The Neverslip Horseshoe Co. of New Brunswick, NJ , began offering in 1880, a special wrench for tightening calks. in 1897, they offered a new design patented by James W. Johnson in August 1897. here is one with that patent on it, and one without.