just posting. Freeman technical summary pg 10. 1923 officially set 95.5 cu,3 tin 1.5 zinc.....ghosting 1923-april 1942???? April 1942 97 cu,0.5 tin due to shortage of tin from malaya 2.5 zinc....ghosting april 1942-october 1945??? from october 1945 to june 1959 same composition pre 1942,that will be 95.5 cu,3 tin 1.5 zinc.... october 1945 to june 1959 ghosting??? june 1959 onwards same composition of 1942-1945,97%cu 0.5%tin,2.5%zinc october 1959-1970 ghosting??? I dont know what company supply the flan,boulton,heaton or king norton and in lastriant nor the color or toning or hypo finish.