From DD:" Chain: Everest with slotted outer plates - keep an eye out as there are one or two Ebay sellers who sometimes list a couple at a time as a package deals. Everest chains are every bit as good quality as Regina, just not as well-known or expensive."
I ditto that advice. I picked one up for $70 on the 'bay, and have another being shipped now. The first one was so nice I had to stock up, the slotted model is really as, or nicer than, a Regina. And it's got rarity points.