I have had several people question the differences in vintage inline Susan Bates hooks and the new ones made in Mexico. Soooo...I am going to attempt an explanation .
The difference is more evident in the steel hooks.

The top hook is the made in Mexico hook, the middle is made in Japan and bottom is made in the USA. The USA one has a shorter shank and flatter throat than the other two. The others have more of a scoop for the hook than the classic inline shape of the USA hook.
Aluminum hooks...
are very similar (top is USA) (bottom is made in Mexico). The one made is Mexico has a more pointed head and the throat is not quite as flat. Also the throat on the one made is Mexico is a little shorter than the USA hook and though it doesn't show on the picture there is more space for the yarn in the USA hook.





