I'm not sure if this is a replica or genuine. Every fat man I have seen has a different combination of characters. Any thoughts? It's 27.2 grams and 45mm across.
Welcome to Numista. Unfortunately weight is wrong, diameter is wrong, Strike and wear is inconsistent, etc. It simply does not look right from the start. The Chinese are prolific counterfeiters. As with any Chinese coin, it is safer to regard it as a counterfeit until proven otherwise.