jon, I’ve been working on this on and off for months now, but I think my research listing the world's #EiffelTowers is for the moment complete
467 towers in my list (of which status unknown 31, and destroyed or never built 42)
Of the rest, 268 are to be found in Google Street View, 126 are not
And of the towers still likely standing today, 358 are replicas, 25 resemblances, 11 derivatives
Many but not all mapped here https://umap.openstreetmap.fr/en/map/eiffel-towers-derivatives-and-replicas_1006050#4/52.11/16.13
Next: complete the map 🙂