Manufacturer's part #01 LAO 226. Original price: $90.00. Made of crown and flint glasses (not cemented but we sell balsam!), design wavelengths are 486.1nm, 589nm, and 656.3nm. 30mm diameter with a focal length of 260mm. Surface quality is 60-40 scratch and dig. Edges have a .25 - .50mm bevel. Unused.