As a follow up to a prior post, I've attached pics of an E Arizaga 28 ga for anyone who's interested. Don't know the year, but I'm pretty sure it's pre Diarm.

It's not a "best" gun, but it seems to be a pretty good gun. Arizaga copied the best features of english guns. The H&H detachable sidelocks are obvious. It's not a good picture, but the breach end of the barrels shows the double bite with hidden third fastener. The front trigger is articulated. Chopper lump barrels, or so it seems. The floral ingraving isn't to English standards, but I've seen worse engraving on favored American guns. Barrels are 25" and it comes in at almost and exact 6 lbs.