I understand the chain makes it usable, not disputing that... however this one is hung on a wall in a museum, not going to get ridden. As a period piece on display that chain spoils the look.
There's similar Chater Lea on Hillary Stone at the moment:
most likely on there as those old skip link chains are nearly impossible to find.
that 1/2 chain makes it usable at the end of the day, surely that cant be a bad thing?