1971
The Browning Auto-5 with serial number 103987 appears to be from the early production period, most likely before 1940. However, the serial number by itself isn’t enough to pin down the exact year because Browning’s records for early Auto-5s are incomplete. I’d recommend checking the complete markings on the receiver and barrel, including any letters, proof marks, gauge information, and whether it was made in Belgium or elsewhere. Those details can help narrow down the date much more accurately. Browning also notes that early Auto-5 production dates are sometimes estimates because very few records from that period remain.
If your browning auto-5 was made in 12gauge then it was made in 1925,if your shotgun was made in 16gauge then it was made in 1929.
your browning auto-5 magnum was made in 1972.
What is the question? Yes, Browning made a 3 shot Auto 5 in the 1930's and in the American made Auto 5's in the 1940s.
your browning auto-5 was made in 1925.
your browning auto-5 was made in 1956.
Auto-5 Lightweight 12ga made in 1960.
If you are talking about a auto-5 shotgun? Then your auto-5 magnum shotgun was made in 1959.
With the serial number that you provided,your browning auto-5 shotgun was made by FN of belguim for browning in 1907.
If you have a Browning auto-5 shotgun in 12 gauge,then it was made in 1925.If you have one in 16 gauge,then it was made in 1929.
Your browning model auto-5 12 ga was made in 1928.
your browning auto-5 was made in belguim by FN in 1914.