Which models are now built on the 28 gauge frame instead of the old 20 gauge frame?

As of  2005 the small 28 / 410 gauge frame is offered on the following models that are sold with 28 or 410 gauge barrels:

686 Silver Pigeon S (2005 + up models)

687 Silver Pigeon III (2004 + up models)

687 Silver Pigeon V (2004 + up models)

687 Gold Pigeon II EL (always on small frame)

687 Diamond Pigeon EELL ( always on small frame)

The small frame can also be identified by measuring the overall height of the receiver (from top to bottom) in the area just in front of the top lever but behind the breech face.  This measurement should be equal to 2 inches.