For whatever reason, the matting ends correctly and there is no line marking the end of the matting... however, the end of the rib has been engraved with the 'zig-zag' border similar, but longer than, the border engraving or "graver walk" on the V-grade frames. I've only seen this on a very few Parkers.
The "wavy lines" are called 'rib matting' and this was done on Parker Bros. matting machine.
Parker Pages published a two-part article on Parker Bros. various machining processes in manufacturing the Parker Gun. Rib matting was fully described in the articles.
Bob refers to the "wedge" appearing to be intact - I agree. The "wedge" however, is called the "keel" and there several of these spaced strategically beneath the top and bottom ribs that were used to properly align and space the ribs for the soldering process.
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