The M1 Carbine was produced by no less than 10 manufacturers during World War 2. Other companies made it, but only post war.

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IBM                   Inland                National Postal Meter               Quality Hardware              Rock-Ola

Saginaw               Saginaw/Irwin-Pedersen              Standard Products              Underwood

Winchester

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Serial #                       Manufacturer / notes

1 - 5                               Inland (Toolroom Models)

6 - 10                             Winchester  (Toolroom Models)

11 - 99                           Inland  (Engineering  & Experimental)

100 - 999,999               Inland

1,000,000 - 1,349,999 Winchester 

1,350,000 - 1,449,999 Underwood 

1,450,000 - 1,549,999 National Postal Meter 

1,550,000 - 1,662,519 Quality Hardware 

1,662,520 - 1,762,519 Rock-Ola 

1,762,520 - 1,875,039 Irwin-Pedersen/Saginaw

1,875,040 - 1,937,519 Quality Hardware 

1,937,520 - 1,982,519 National Postal Meter 

1,982,520 - 2,352,519 Standard Products 

2,352,520 - 2,912,519 Underwood

2,912,520 - 3,212,519 Inland

3,212,520 - 3,250,019 Irwin-Pedersen/Saginaw 

3,250,020 - 3,651,519 Saginaw

3,651,520 - 4,009,999 IBM

4,010,000 - 4,074,999 Underwood 

4,075,000 - 4,075,009 Winchester

4,075,010 - 4,432,099 National Postal Meter

4,432,100 - 4,532,099 Quality Hardware

4,532,100 - 4,632,099 Rock-Ola 

4,632,100 - 4,879,525 Quality Hardware 

4,879,526 - 5,549,821 Inland 

5,549,822 - 5,549,921 not assigned 

5,549,922 - 5,834,618 Winchester

5,834,619 - 6,071,188 Saginaw

6,071,189 - 6,099,688 Rock-Ola 

6,099,689 - 6,199,688 Underwood 

6,199,689 - 6,219,688 Rock-Ola 

6,219,689 - 6,449,883 Inland 

6,449,884 - 6,629,883 Winchester 

6,629,884 - 7,234,883 InlandModel M1 & M2

7,234,884 - 7,369,660 Winchester Model M1 & M2

7,369,661 - 8,069,661 Inland Model M2