B63-565. ADJUSTABLE SIGHTING LEVEL. Preston & Sons. 12" ebony level with brass top plate and end plates, sighting tube through body. Level vial in top and outboard plumb vial on rear. Brass adjustable holder with pin to be inserted in tripod. In a fitted wooden box, no label so we don't know if it was supplied by Preston or made by the owner, in either case it's kept it in crispy clean condition, ebony has its original finish with Preston's mark and "Improved Warranted Correct" on the sides. Fine 200-400