FN made the superposed, not Browning. FN sold double trigger guns post war. I believe none were marked for sale by Browning. Browning took more than 50% of the pre war guns and sold them in North America. FN sold to the rest of the world.
Early Brownings could be ordered to fire the top barrel first with selective triggers, and to fire the top barrel with the front double or twin single trigger. They are fairly common. I do not understand why, but apparently there was some customer demand for what today seems to be an unconventional firing order.
