You might want to check in with Tim Graham and George Wheeler over at
http://www.usmilitariaforum.com/foru...edged-weapons/
Both are familiar with anything m1902 from cadet to the Philippine Constabulary rigs. They also both frequent SFI Sean Scott (Varagian) also has a wealth of info and background for the M1902.
The single chain and hook arrangement dure to the fact that the sword was relegated to dress/parade use only. The French single ring move was (iirc) because of the sword being attached to the saddles rather than belt straps (the older swords having the middle fitting removed, band and all). The infantry swords retaining two rings.
Cheers
GC