Here's what I have so far: Once I have all dates, will create an image with dates etc.
A. 1977 to 78 no markings or may have T-N sticker - Square corner
B. 1979/80 "Tuf-Neck" and "Patent Pending" engraved on top - Square corner
C. 1980 - Tuf Neck 2000 - rounded front and back
D. 1981 - Introduction of the tiger engraved on top and "Tuf Neck USA"
E.
? - Rounded corners with Tiger and Tuf-Neck USA
F.
? - Rounded corners and hollow bolt for cable, has Tiger and Tuf-Neck USA
G.
? - Rounded corners and hollow bolt for cable, cut out for bolt, has Tiger and Tuf-Neck USA
H.
?
I.
?
If there's one missing, please add a pic and provide year, will insert as A.1, .2 etc
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