Marc, I was busy today, will try to pull out my firing pins and look tomorrow (those are the blank spots).
These are pictures folks sent me for the book that happened to show the firing pin,
dated 1925 sn 12 (note E6 is not by sn but on flange) non-fluted
dated 1925 sn 378 nonfluted
dated 1926 sn 684 fluted
sn 701 #99 and has an eagle 6 non-fluted
sn 2014 unfluted
sn 2031 # 31 and is fluted
sn 4004 which I sold was unfluted
sn 4865 unfluted
sn 5940 unfluted
sn 6069 unfluted
sn 6923 unfluted
sn 8660 unfluted
sn 47a has 46 and Eagle 6 is fluted
sn 554a unfluted
sn 866a (Vopo w/ almost all eagle 6's everywhere) firing pin is #66 and Eagle 33 fluted
My feeling is that they came with unfluted and were replaced when the requirements changed
Ed
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