I have to admit I'm another Superposed fan, despite the lack of exposed hammers...

Early Superposed guns marked only Fabrique Nationale d'Armes de Guerre made their way to Canada, before being available in the USA with Browning markings. Here is a 1930 field-grade Superposed marked in this way, serial number less than 500. I also have a 1951 20-gauge with similar markings (though with the single trigger).