if you read each term out:
z = "one zed" = 1z
1z = "one one, one zed" = 111z
111z = "three one, one zed" = 311z
so the next one is
311z - "one three, two one, one zed" = 13211z
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The next character in the series, "1Z Y2 3X W4 5V" is "U6".
your browning shotgun was made in 1961 with the 1Z prefix to the serial number you provided.
12+1z
1Z is Italy I believe..
Your browning auto-5 shotgun was made by FN of belguim for browning in 1961.The 1Z prefix dates to that year.
40nm, 70nm, 113nm
factors of 2yz - 1y, 2z, 1z, 2y, 1, 2yz
1 = 1961, the year of manufacture Z is the letter code for the Auto-5 Light Twenty (as opposed to the Magnum Twenty) 55149 is the rest of the serial number sales@countrygunsmith.net
79-87 ft lbs
its 10x +9y +1z
Browning.com has a sn function under customer service.
9z-5z = 30+z 3z = 30 z = 10