I've got a Davidson D275 autocollimating/alignment scope that was manufactured sometime just before 1964 (serial no. 400). It is in excellent condition. The lenses look like new, with no marks in the coatings. The internal diagonal mirror has some fine, spidery marks on one side, but these shouldn't affect the use of this scope at all. The power pack for the illuminator has some tape residue on it, but functions fine. The housing and stainless steel bore have no corrosion on them and are like new. The scope comes with a nice, fitted, hardwood case and extra illuminating bulbs, but does not include any reticles. This instrument was manufactured to incredibly exacting mechanical and optical specifications. The optical and mechanical axes are coincident to within 3 arc seconds at 25 feet. These units currently sell for just under $10 000 new from Davidson, and generally go for $3500 to 4000 on the used market. Was considering consignment of this scope for $4000, but would prefer to sell sooner than later. I am asking $1500. Serious enquiries only please.