So I was looking through some /306\s, categorizing certain things when I noticed something interesting:
13th year:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/13_mil_T306.jpg~original)
14th year:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/14_mil_T306.jpg~original)
15th year:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/15_mil_T306.jpg~original)
16th year:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/16_mil_T306.jpg~original)
17th year:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/17_mil_T306.jpg~original)
18th year:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/18_mil_T306.jpg~original)
Then it stops (maybe we just don't have the 19's through 22's yet) and starts again at 23rd year:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/23_mil_T306.jpg~original)
Well that's a different looking stamp. This 3 is totally different than the stylized "Sigma" style 3 from the previous stamps. The 0 reaches way up too and has a sharp point on top.
WTH? Maybe it's a fluke? Nope:
(http://i1352.photobucket.com/albums/q647/jelucer/misc/SNs/23_mil_T306_2.jpg~original)
How'd we miss that one? :))
It looks like the /306\ factory most certainly has two different stamps. It'll be interesting to see when that transition actually occurred and if there were ever any recurrences of the early style stamp. thumb1