http://www.remington.com/library/history/firearm_models/
1919
Early 1913
The Remington Model 11A, a semi-automatic shotgun, was produced from 1911 until around 1947. The serial numbers for these shotguns can vary, but specific serial number information is often used to determine the manufacturing date. For precise dating, consulting a Remington serial number database or a firearms expert would be advisable.
(11a + 8b)(11a - 8b)
(11a-8b)(11a+8b)
9a + 3b - 11a - 4b = -2a -b
2a + 11a - 5a = 8a
11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3
12a-a = 11a
The postcode for 11A Pentire Road, London is E17 4BY.
It is -11A.
11a-3a =8a so 8a+9=-7 8a = -16 a=-2