The next character in the series, "1Z Y2 3X W4 5V" is "U6".
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
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
0.1111 times.
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