The 11 inch batwing is among the less common rizzuto knives and more desired. These were made in the early period when rizzys had a mid lock design, but those were vastly different. They were made in the 1960s in what seems to be the mid period, but haven’t seen them in step bolster. For sure 11 inch batwing rizzys were made in the late period such as this one. It sports the shiny black beautiful black scales. 
