Interesting Saddle

I am looking for help identifying this saddle.  It resembles a McClellan saddle, the pitch on the pommel and cantle are the same as the M1904, but the shape of the pommel and the horn are radically different.

Near side:

Off Side:  

Pommel:

Note pommel and horn details compared to
the M1913 McClellan in the background.

Cantle:

Cantle Seam Detail:

The lace if fibrous and looks more like sinew than rawhide.

Detail of off side bar at cantle:

Note iron staples, iron ring and method of attachment.