Ontario Antique Tools » The Tool Shoppe » Miscellaneous » TWO SMALL BONE ITEMS LETTER OPENER, THERMOMETER JOHN DAVIS DERBY TWO SMALL BONE ITEMS LETTER OPENER, THERMOMETER JOHN DAVIS DERBY TWO ITEMS. LETTER OPENER UNMARKED. J DAVIS DERBY #3 BONE/GERMAN SILVER THERMOMETER.....ALL EXCELLENT ....THE RULE PICTURED HAS BEEN SOLD. Updating...