GSGS Series 4228. Second Edition. Photolithographed by the British Ordnance Survey in 1943. Revised by 49 Survey Coy., S.A.E.C. Oct 1944 and Reproduced by N2 Litho. Sec. M.M.P and P. Coy., S.A.E.C., att., Nove 1944. The meridians are based on the meridian of Rome, which is 12 degrees, 27 minutes and 7.1 seconds east of Greenwich. North Italy Grid Brown.