Harmonic is closest I think. I sold a pistol pack just like that, minus the 15" (?) barrel, for $1050 on Gunbroker, let's see, about Dec. 2007. Prices haven't really changed on these much since then. That gun was literally mint. That one looks like it could be mint but it's hard to say from the photo.
So, the value on that is likely from $700 to $1200 based on the wear/tear on the gun and barrels. The pack itself looks complete less the belt buckle (yes, they came with belt buckles!). Should be a manila envelope with different color sight blades, too.