Yes Edgar, they are unusual. The owner has mentioned his set on more than one occasion in this forum, here's one of those mentions:
http://parkerguns.org/forums/showthread.php?t=15370
I hope the owner sees this request and will post pics of his complete gun, including the wood. Not only is the gun unusual, but an original Parker Reproduction 2-bbl. case capable of housing a set 30" tubes is unusual as well.