2 copper printing plates for the music to the song "Gray Days". 

The song was published in 1909. (We googled it)

That is also likely when they printed the sheet music for it.

We attempted to make a printed copy shown on the two pages in the photos. 

It may be easier to read in the last 6 photos when we took photos in a mirror. 

 

  Both are mounted on a wood block. 

  They' 8 7/8 x 6 inches wide. 7/8 inches thick.

  Together they weigh 5 3/4 pounds