Joel Chamblin Large Slipjoint with Micarta Scales. #O27.
This is a beauty made by long time maker Joel Chamblin. It is a slip joint folder that measures 4" closed. Micarta scales with a federal shield on the front, stainless pins and a lined thong hole. I think this model is called the "Backpacker", but not positive. Large swedge on the blade with large thumb nick. The back of the blade is marked "CPM-154". This is a hefty knife by one of the best. Ask for knife #O27.