Well, there's a hot mess. Did you refuse to pay the ransom? Those pics demonstrate how digital photography can sometimes work against you. too much detail.
Those pics need some sort of supporting documents. There's no proof, without the letter, to say Parker cut them. There is no proof one could say(one with a vivid imagination) the keels present aren't original, or, replaced.
The keels always extended out the front, in the initial soldering process, and were them cut flush during finishing. Their length had as much to do with gauge also, because the ribs needed to rest on something firm to keep them squared up when they were wrapped.
Keep in mind, also taking into account Mike's comment re balance, that solder is nearly 4 times heavier than steel. Large cavities needed to be 'filled' with something, (keels) to A, prevent filling them with solder, adding weight, and, B, to prevent shrinkage withing the solder as it solidifies. Solder solidifies like steel, like a thickening envelope, leaving a void in the center. Voids are little places where moisture takes up residence.
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