Knitmaster SR302 ribber is a rare attachment matching turn-knob knitting machines (Studio SK302, SK303, SK301, Empisal ES302, Empisal Knitmaster mod. 305, Silver SK305, Silver SK302, Silver SK301, and potentially some later models, SK313-315) to find as it was released to the market in the mid 1960s. Studio SR302 ribber model is somewhat similar to the SR301 and SR303 ribbers.
Stay tuned as I am looking for pictures but check out posts of identical Studio SR302 and SR305 ribbers.