Atypical vintage Hamilton. I’m not certain that Genta designed it, although he did work with the brand at some point in time. Personally doesn’t make it or break it whether he wasn’t involved, as it’s just a fun one (and I’m not an octagonal case nut).
A fellow on YouTube also had one he recorded a video about which I’ll link below.
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https://youtu.be/U74X7nf9qpk