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This example has been repainted, and features additional aftermarket chrome on the seatstays.
Not original, entirely possible that the slot is aftermarket too. It also looks deeper than yours so could be a general problem with that design and the lugs cracking.
Either way, why so rude/defensive? Post a hi-res close up and it will be easy to see if it's a factory design or a DIY fix.
You're wrong again.
http://velosniper.blogspot.co.uk/2008/11/gios-compact-record-frame-and-fork-57cm.html