Here is what I found today;
I picked another 450 book it had early models, and part # was in there..
showed as speedo cable , NOT tach..
Which I tend to believe, as
cable from metal to metal end is just under 36 inches
Large knurled ring, and standard ring on speedo end, seems to jive with the early, seperate drive (not in hub)
Anyway , nice greycable, looks NOS, minor shelfwear , it is...