twriggen, I called my friend in Omaha. He is an avid Ruger collector with over 300 Ruger handguns and more than 200 Old Models. We discussed the "Type 1 frame issue" and he is of the same opinion as me .... it's not a different frame, rather an anomaly in the casting that can occur in any model. Tonight, he brought his LNIB Type 1 Flatgate to my house so we could compare it to my Type 3 Flatgate.. I don't doubt there are some anomalies but neither of us could feel or see the "dip" you spoke of.
BTW, there's no such thing as a "breach face" in a revolver ..... it's called a recoil shield. Rifles and pistols have breach faces or bolt faces but not recoil shields.
I like your Hawkeye. I have a LNIB Hawkeye complete with a Bushnell 1.5X scope, made specifically for the Hawkeye. I recently got a 20-round box of 256 Win Mag ammo so at long last, I can shoot it. I've owned this gun for 10 years, but with no ammo. Hawkeyes are a strange breed. First off, they are a single shot. They do resemble a revolver but the "cylinder" is not a cylinder at all .... it works like a breach block. The cartridge is actually chambered directly in the barrel and the pseudo cylinder locks it in place and contains the firing pin. According to BATFE, it is not considered a revolver, rather it falls in the same "pistol" class as a Thompson Center Contender.
The "plum" color, lightning streaks, and blotching was a very simple fix. Brownell's came up with a "Type S" additive where a small bottle in a large bluing tank made the guns come out blacker than a whore's heart .... and they stayed black. Ruger collectors go GAGA over the bluing defect. I have several OMs with the plum color but it does not excite me. As it turns out, the chemical reaction with bluing salts can take up to 20~30 years to stabilize so even guns that left the factory with a nice bluing job. may turn plum colored as they age. My early Type 3 Round Gate Single-Six is a prime example. The bluing was perfect but now you can see some slight plum color in the cylinder frame and loading gate.