I'm guessing that it's using to original axle since it appears to be using the stock CM forks. You should post close up pictures of the left and right side of the axle ass'y since it's a morphodite. Might also send a PM to 76Twin, JamesPal, crazypj and some of the other 450 folks asking them to review this thread.
Depending on thread diameter, it's either CB450 (1968~) or CB72~77
Can't see operating arms very well but they look like the earlier cast/forged ones of CB77? (CB450 normally used pressed/spot welded arms, like CB350's)
Looks like speedo drive is broken anyway, it shouldn't look like that
Is there another speedo drive assembly that is correct for the wheel? Or is there a spacer that is normally between the fork and the speedo drive? It seems like there should be something holding the assembly to the wheel. I wouldn't mind buying the correct drive/cable....just don't want to go around in circles.
The axle holds everything tight. What has happened is someone didn't line up drive properly and the thinnest part of shell broke. When you remove drive you'll probably find internal damage to various parts. It could also be the wrong drive for that wheel. 450 and 250/305 look the same (except for cable threads) but are not interchangeable
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