Up for sale is an 11x14 wooden spring back. This back is in fair shape overall. It shows typical wear from age and use. There is no ground glass included. Some retaining hardware is missing and will need to be replaced. Springs have good tension. 

I have no idea what camera this is from. The back is attached to a wooden spacer of sorts that cradles it with two brackets on the base and pin catches on the top. 

The spring back perimeter measures 16 3/16ths x 16 3/16th inches or 41.1 cm x 41.1 cm. 

The inner bevel of the spring back is roughly 15.25 x 15.25 inches. or 38.7cm x38.7cm.

The spacers larger perimeter is roughly 17 x 17 5/8 inches. or 44.8 x 43.1.

For the film holder, the base to rib notch is  roughly 15 5/8 or 39.8cm.

Pin to pin distance on puter perimeter is 14.5 inches or 36.8 cm. 

Please let me know if you have any questions.