A very high quality fine red circle type reticule by Brysen. Plain flat glass plate : 45mm diameter 3mm thick , ground edges. Has cross hairs, small centre circle and centre dot. Status: NOS (New Old Stock) ex military stores. Brysen are noted for military sights, gun scopes, laser imaging, scanner imaging,satellite imaging systems. No data available on these as althought in original wrappers, there was no documentation or NSN numbering. Ideal for the experimenter and VERY, VERY CHEAP !