This siding (which I had specially milled) is left over from a garage addition to my home and is hard to come by now days.
It is a nominal 12" wide and beveled from 1" at the bottom to about 1/8" at the top. This was common siding for homes built in the 60s and 70s.
I have (2) pcs. 16' long and (1) pc. 14' long, with a straight lower edge (the 1" thick edge).
I have (5) pcs. 16' long and (1) pc. 14' long. These have the wavey edge cut along the bottom (1" thick edge) which is very common for this siding. It gives the impression of being cut directly from the log. Selling for $5.00 per lineal foot.
The wavey edge can be easily cut into the straight edge boards with a jig saw as needed.
I only check emails once a day so you may want to call or text. Larry cell: two53-six3one-845two.