To the far right of the front steep face of the boulder is a close-growing tree. Low and just left of this is a small jug with a pebble/knob in it. Match start here, traverse left into a deep jug rail, left more into a long gaston rail, and gain the high right crimp.
Nab the crimp at the lip of the boulder and work left into a sloper and a better large knob. Pop out left more to the massive "bathtub" jug at the lip and roll over for the mantle.
Could be in the v4/5/6 grade range, who knows..