Definitely an early Superposed. Serial number should not be much above 1000. Is it marked "Browning" on the barrel? FN sold guns everywhere but North America and they were slightly different.
The trigger looks suspicious. Is it selective with the selector in the safety? If so it has been changed. It may have been done at the factory. I have been told after World War II Browning refused to repair the twin single triggers and instead installed a single trigger.
Call Glen at Browning in Morgan Utah. He will probably have access to the original records on the gun and tell you how it was originally configured.
The engraving does not appear similar to what I have pictures of on early Browning Superposeds. The style also seems "heavier" or coarser than those I have seen. However at the time this gun was made the guns were usually special ordered and not much was standardized. From what I can see it looks like the early Beavertail fore end. If it was a trap gun or pigeon gun it is quite possible that it was full and full, and that a non-selective single trigger was originally installed.
