old mystery / detective stories, vintage 1912 Lock & Key books set

Nice old (dated 1912) set of the Lock and Key Library, all mysteries, adventure and detective stories, with front illustrations, and a rather Arts and Crafts style, all deep red leather textured paper bindings. These measure 7 1/2" x 5 1/4", the eight books cover a shelf space of 10 1/2". These look good for their age, but are showing some use - one torn spine, cracked joints, etc..