What kind of blades do you want? The congress pattern refers to the way 4 blades, 2 large and 2 small are fitted within the handles using 2 backsprings. However, what specific blades are actually used varies greatly between different manufacturers, and differs even within a certain manufacturer's definitions. You can find ones with twin large sheepsfoot blades and twin small pen blades, ones with sheepsfoot and spear master blades and twin pen blades, ones with 4 different blades, etc.
Congresses tend to come in 3 sizes: small (~3 1/8"), medium (~3 5/8"), and large (~4 1/4"), give or take 1/8".
So, other than having stag handles, what specifically were you looking for? In my own searching for my "perfect" pocket knife I've done an excessive/obsessive amount of researching, so if you can be more exact, maybe I could find the "perfect" one for you.