It looks as though Richard is sporting both the straight and horned-end examples of the JB Champion mesh...or is it just the photo angle?

 

Yes, they appear to be two different end pieces. Armstrong has a straight end as well.

 

Makes you wonder which was first, and if he broke and that was the reason for the change.

 

You've a sharp eye M'Bob!

An Original and Regular version perhaps. ...

 

The first JBs on the NASA scene appear to be straight ends and the curved ends appear later. Why the change on the Gordon watch, who knows.

 

Remember, some astronauts received more than one NASA-issued Omega Speedmaster chronograph...