Welcome to the Forum. Belgium copied many models of revolvers and shotguns. Of course most were patent infringements, but apparently it was difficult to prosecute across the ocean in the late 1800s. Many companies in Belgium made these copies in various levels of quality. Some were quite poor quality and were poor copies, but some looked almost identical to the guns they were copying and of high quality.

320 is a caliber listing used in Europe but basically 32 caliber similar to 32 Short Colt and 32 S&W. These cartridges will fit some 320 models from Belgium since quality control was poor. There was a popular model called a Bulldog made in this caliber. I think they started out in England in the 1870s, made by companies like Webley and others. Fiocchi still makes and sells the 320 Corto round.

If it is a Belgium copy, it should have an oval with the letters ELG stamped on the rear of the cylinder or maybe under the stocks. There were some other countries in Europe that also made patent infringement copies as well.

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Gary
SWCA 2515