Made in Sweden by Aga. It seem to be a 5th order lens. It has some blemishes but it is in very good condition considering its age (see detailed pictures - it is almost impossible to find this kind of lenses intact). I will take more pictures to show blemishes more detailed. It weighs approximately 80 Lbs.All defects not mentioned but visible in the pictures will be considered as described. If you have any question, please do not hesitate to contact me. Thank you for your visit. The item "ANTIQUE LIGHTHOUSE 5TH ORDER FRESNEL DRUM LENS 1920 BY AGA 45 CM DIAMETER RARE" is in sale since Monday, April 02, 2018. This item is in the category "Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Other Antique Science Equip". The seller is "liancollect" and is located in Buenos Aires, Buenos Aires. This item can be shipped worldwide.