No.
The FN Catalog in the early 1910s listed the vent as an option. When Browning began importing in 1923 as the Browning Arms Co, they were available on all automatics for an extra fee.
iam not sure on the grade but its value is about 3-5 1/2 grand depending on its condition.
Your browning auto-5 shotgun in 16ga. Was made in 1922.
Your gun is a Standard Weight model made in 1961. The suggested retail price when new was $134.50 with a plain barrel - $154.50 with a vented rib barrel.
100-350 USD
Blue Book of Gun Values; Browning website under customer service
That is a Light-20 made in 1960. In excellent shape, over $1000. In 'shooter' condition, about $500.
Incomplete serial number. Value from $500-$1000.
a vented battery is vented and the regular battery is regular
The Winchester model 1894 rifle was never made with a vent rib barrel! the only Winchester made firearms with a vent rib barrel was Winchester shotguns.
A vented gas cap vents the gas fumes into the atmosphere. A non-vented cap system routes the fumes thru the engine to be burned.
Browning.com has sn data under customer service. You can request a factory letter for @@ 40 USD>