Similarly https://www.xzegarki.pl/kategoria-produktu/zenith/ to its smaller cousin, the 6536, there are multiple different hand sets that are correct for two-line 6538s. They can have either the slimmer white seconds had or the https://www.xhorloges.cz/ slim brass seconds hand – this is in https://www.watchesx.org.uk/Collection/zenith/ contrast to the four-line 6538, which, in theory, should always have a large white seconds hand if it's in true original condition.