The oldest gun in my humble 99 collection is a circa-1929 takedown F in .303. My next oldests are a 1933 R and a 1957 EG, both in .300. The R and EG have the lighter silverish colored blue and the F has a noticeably darker black blue. All three are in pretty good original condition. What is the difference in how the two types of blue were produced?
Last edited by S99VG; 10/01/16. Reason: Forgot to mention the date of the F
