50-250 usd
Simply means 'special steel' in French.
The term "acier special" is found on many Auto-5 shotguns. It is French for "special steel". The stamp "acier special" found on barrels are for Fabrique Nationale guns, and NOT Browning Arms Co. guns. Fabrique Nationale (FN) was the manufacturer of all Belgian Browning guns. Browning was simply an importer and bought guns with their name on them to sell in the United States. FN was licensed to make and sell some of these models World Wide outside the US. If it says "acier" on the barrel then, you probably have an FN gun. It's possible to have one of these barrels fitted on a genuine Browning gun, but then the receiver would identify the mix & match. FN Auto 5's as a custom, used the term Browning patent on many of their guns along with acier special. These guns never were sold in the US, but somehow made it to the states from overseas. Many guns were brought by returning US servicemen from WWII and so on.
1932
$350-$850
Basically impossible to value with no other information.
Please re-ask the question and provide the model and guage or type of gun. "Acier Special" means special steel and is stamped on many different models.
Acier special means Special steel, and barrels marked this way are only on FN sales guns, not Browning. FN produced the guns for sale outside the US and were not imported to be sold by the Browning Co. The FN version is mechanically the same as the Browning version, but markings and finish may be different.
50-500 usd
50-500 usd
You need to give more information. I assume it is a shotgun, but "Acier Special" just means it was made with "special steel" and we would need at least a model number to start looking for the manufacture date.
You will have to ask Browning.