Jim-sorry but no I do not know the year or model. Here is another picture. It doesn't help but just shows it is a small machine.-
It could be a Koehring, not sure. There is a guy on here named "bartles" that is building a model of a Koehring 305 dragline. He sent me these pictures. Look on page-8-for his thread but he hasn't been on here for a long time.