I think all wavy lines on all Parkers were cut by the machine not "Pressed" in.
If you read the description on how the rib matting machine works it states that it cuts the lines.
They could roll stamp the parker name on the solid or concave rib guns, however with no support on the Vent Rib guns they had to hand engrave it. It also states in the machine description that the name was rolled onto the rib before the matting was cut and there is an adjustment on the machine to stop the lines from cutting the rolled on name.
It looks like they stopped engraving on the later guns to cut costs.
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