b61-530 QUICK ADJUSTING PIPE WRENCH. Penney Patent. John Penney of Mechanics Falls, ME, started out making these wrenches before he switched to making the ornate Dirigo Jig Saw. The lower jaw slides to adjust and is held in place with a long cast spring which is almost always broken, but not this time. A very rare wrench; the Davistown Museum had one of the few known examples and it was stolen (we didn't do it). Mark is faint but legible. Good+ 150-250