Strikes me these loose chains with out scabbard fittings attatched will invariably be bogus. Surely the field upgrade story can only be given credence if the chain has upper and lower scabbard fittings already attached so Herman just has to undue four screws take off the upper and lower scabbard fittings on his M33 and slip on the chain assembly and replace the lower scabbard fitting job done

the chains we see loose invariably don't have the link that needs to be brazed to the upper scabbard fitting after removing the ring and fixing from the original M33 scabbard fitting

For these reason I believe the field upgrade story is yet another myth that has been stated so often it has become fact go figure