Columbus Showcase anique wood and glass showcase

I  have an old Columbus showcase that came with our antique building when we purchased it.  Our building was built in 1904.

This piece is 8 ft long, 40 1/2 inches tall, and 24 inches deep.  This  piece has four wood and glass doors that enclose the back.  these doors slide.

The middle shelf is made up of slats, not solid.  There is no lighting.

i am trying to establish when Columbus Showcase first started making showcases.  I believe this is made before 1908. 

Good