The L Prefix started in 68 and thru 74 (I think) The 'L' pre-fix first letter code for Remington 1100 after the 1968 Gun Control Act. That would date 1100's from 1969 thru 1973/74 then the next letter code was 'M'. Those early 1100's were just outstanding, owned a few, they took America by storm along with the 870 Wingmaster. Founded in 1816 by Eliphalet Remington. Company has distinction of being oldest firearms manufacturing firm in United States. Since 1856, it has been known by four different names: between 1856 and 1888, E. Remington & Sons; 1888-1910, Remington Arms Company; 1910-1925, Remington Arms U.M.C. Company (Union Metallic Cartridge Company); and 1925 to present, Remington Arms Company. Manufacturer - Remington Model - 1100 Skeet Serial number- M406811X / Date code OU Year of manufacture - July, 1971 Estimated Value Range –see below. For your firearm, the following current values apply (from the Blue Book of Gun Values). Retail prices may be 20% higher.

Description: Gas operated 5-shot autoloading shotgun

Remington 1100 Serial Number Decoder

Introduction Year: 1963

Remington Firearms

Year Discontinued: Currently in production

Remington 1100 Serial Lookup

Total Production: N/A

Designer/Inventor: Wayne Leek

Action Type: Autoloading

Remington Model 4 Serial Numbers

Caliber/Gauge: 12-gauge (1963), 20-gauge (1964), 16-gauge (1964),28-gauge (1969), .410 bore (1969)

Serial Number Blocks: N/A

Grades Offered:
1100 Field – 'Standard' Grade
1100 TB – 'Trap' Grade w/ better wood
1100 SA – 'Skeet' Grade
1100 SB – 'Skeet' Grade w/ better wood
1100 D – 'Tournament' Grade
1100 F – 'Premier' Grade

Variations:
Magnum Duck Gun
Deer Gun
Lightweight 20-gauges (LW – New 1967) (LT – New 1977)
150th Anniversary edition – 1966
Matched Pairs in .410 bore & 28-gauge skeet (New 1969)
Left hand in 12 & 20 gauge (New 1972, 12 & 16-gauges)
Youth Gun 20-gauge
Synthetic Models (12 & 20-gauge, also Camo)
Ducks Unlimited Commemorative versions
Bicentennial model
75th Anniversary edition Limited Edition 'One of Three Thousand'
Special Field (New 1983)
Sportsman Autoloader
Special Purpose
Sporting (New 2000)
Premier Sporting (New 2010)
Classic Trap (New 2000)
Classic Field (New 2006) (12, 20, 16, 28, & .410)
Tournament Skeet (2004)
Competition (New 2006)
G3 (New 2007)
Tac-2 & Tac-4 (New 2007)
Competition Synthetic (New 2011)
50th Anniversary (2013)
200th Anniversary (2016)