In his accompanying letter, Winchester expert and author Herbert Houze explains how he determined that this shotgun is "no doubt" a Winchester .410 slide action model room prototype which "can be considered a legitimate precursor to what became known as the Winchester Model 42." The absence of markings, finished in the white and the appearance of tool marks "is consistent with the Winchester Model Room's policy of producing fully functional models to demonstrate the working operations of designs under consideration for further development of production without undue consideration of their exterior finish" as observed on Winchester prototypes held at the Cody Firearms Museum. For dating this shotgun Houze pointed to "the gently stepped rear portion of the rear upper receiver" which has been observed on sample models built in the late 1890s and early 1900s that demonstrate design ideas developed by Winchester chief designers Thomas C. Johnson or William Mason. Moreover, factory developmental design drawings (photocopies included) circa 1919-1920 illustrate specific features found on this shotgun such as the hammer spring guide pin, cartridge spring guide screw, trigger and breech bolt. The receiver was likely originally built circa 1900-1901 for an abandoned prototype and then reused for the making of this prototype, concluded Houze. The shotgun has a 2 inch chamber. Production Model 42s were chambered for the new 3 inch shells as well as the 2 1/2 inch shells. The smooth pistol grip stock lacks a buttplate, and the forearm has 17 grooves.

Very fine, showing a mixture of brown and gray patinas over the unfinished in the white metal. The wood is fine showing some minor dings and scratches. The action cycles properly. A perfect, possibly once in a lifetime, addition for an advanced Winchester shotgun collection, especially for Model 42 collectors!