This sturdy printed leather notebook cover comes with a replaceable insert and a secure snap closure. Available in 5 designs. Measures 4 x 6.25 inches when closed.
 
The last photo shows the interior of the book with a 3.5 x 5.5 Field Notes insert (available here) though the included insert is unlined. Pen not included.
 
Made in the USA by Backerton, a small family-owned business based in Oklahoma City. Photos by Backerton.