I have three sidelock Bayard/Pieper shotguns. They are all hammerguns, all three are different. I think they are greast guns for the money. One of them has about every locking system known to man, sideclips, double underlugs, greener cross bolt, and a third bite.
I also bought an odd Bayard Pieper boxlock at the vintagers, it has a toplever locking system I have never seen before. There are pictures of it on the Gournet website http://www.gournetusa.com/forum/
it is the gun pictured at the bottom of the thread titled "Bayard 12 x 65 hammergun" in the Belgian gun forum. If anyone has seen one, owns one or can tell me more, I would love to hear about it.
It looks like a good idea...?