EBONY & BRASS 19TH CENTURY ENGLISH OCTANT SIGNED: J. BLAIR BRISTOL WITH ERECTING TELESCOPE & SIGHTING TUBE, IVORY SCALE DIVIDED -2 DEGEES TO 109 DEGREES, IN 20 MINUTE DIVISIONS, VERNIER READING TO 1 MINUTE OF ARC, IN ORIGINAL MAHOGANY KEYSTONE BOX. RADIUS 9.1/2" INCHES. JOHN BLAIR WAS RECORDED IN BRISTOL FROM 1829. THERE IS AN OLD REPAIR ON THE BACK OF THE FRAME. THERE'S REMNANTS OF AN OLD AMERICAN TRADE LABEL IN THE BOX LID: BIGGS & BROTHERS. 1 WALNUT STREET, PHILADELPHIA.
IVORY EXEMPTION NUMBER VUZYDG1Y