Church's Custom Grade-Rare Slipped Gemming Sighting?

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u/a_robot_with_dreams and I, u/6t5g found this pair of shoes in a men's store and tux rental shop. We thought this was a significant find that was worthy of sharing with the community. It is very uncommon to find slipped gemming.

Robot and I hypothesized that the gemming failed in this particular instance due to several factors including repeated torsional force as a result of dancing, as this pair of shoes was most likely worn to a lot of weddings. Of course we are happy to hear your thoughts and hypothesis on why such failure occurred.

(By no means am I an expert on gemming failure, and I am not looking to incite any raucous debate on gyw construction. I think that isolated incidents such as this are quite rare.)