Go to Browning.com. There is a sn fucntion. The sn you list does not follow the normal numbering convention.
This is what is called an American Browning. These guns were produced by Remington in the US (New York) for Browning after Belgium was overun by the Germans in WWII. The guns were made using Remingtons model 11 equipment. A few modifications were made to incorporate more of the Browning features and were all stamped Browning Arms Co. St. Louis Mo. Your 16ga gun sn: A187 is missing a number. Serial numbers started at # A5000 and went up. Please ask the question again on the age. Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Auto 5's with poly-chokes, compensators and recoil pads will reduce value. Recommend taking it to a gun shop for appraisal
Only 15,000 Mauser M.1891 Argentine carbines were manufactured by Ludwig Lowe, so it's relatively easy. If the serial number is A0000-A4999 or B0000-B4999 it was manufactured in 1893. If the serial number is A5000-A9999, it was manufactured in 1895. Although 30,000 carbines were originally ordered by the Argentine military, it appears that these 15,000 were the only ones delivered.
the msi website has a full guide
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