| Date | Model | Serial Number |
| 1/1/27 | - | #400 |
| 1/1/29 | - | #3070 |
| 1/1/31 | - | #9999 |
| 12/1/31 | L Series | L1000 |
| 1/1/32 | L Series | L2100 |
| 1/1/33 | L Series | L3250 |
| 1/1/34 | L Series | L4300 |
| 1/1/35 | L Series | L5500 |
| 1/1/36 | L Series | L6600 |
| 1/1/37 | L Series | L7750 |
| 1/1/38 | L Series | L8800 |
| 1/1/39 | L Series | L9900 |
| 2/1/39 | M Series | M1000 |
| 1/1/40 | M Series | M2400 |
| 1944 | M Series | M3400 on |
| 1945 | M Series | M6000 on |
| 1946 | M Series | M8000 on |
| 10/1/46 | N Series | N100 |
| 2/1/47 | N Series | N1000 |
| 1/1/48 | N Series | N2800 |
| 1/1/49 | N Series | N4900 |
| 1/1/50 | N Series | N6600 |
| 1/1/51 | N Series | N8100 |
| 1/1/52 | P Series | P1200 |
| 1/1/53 | P Series | P4200 |
| 1/1/54 | P Series | P7400 |
| 1/1/55 | Q Series | Q1100 |
| 1/1/56 | Q Series | Q4350 |
| 1/1/58 | R Series | R1200 |
| 1/1/59 | R Series | R6100 |
| 1/1/57 | Q Series | Q290 |
| 1/1/60 | S Series | S1150 |
| 1/1/61 | S Series | S4160 |
| 1/1/62 | S Series | S7390 |
| 1/1/63 | T Series | T1400 |
| 1/1/64 | T Series | T5800 |
| 1/1/65 | U Series | U1100 |
| 1/1/66 | U Series | U5700 |
| 1/1/67 | V Series | V1000 |
| 1/1/68 | V Series | V4800 |
| 1/1/69 | V Series | V7900 |
| 1/1/70 | W Series | W1700 |
| 1/1/71 | W Series | W5900 |
| 1/1/72 | X Series | X1500 |
| 1/1/73 | X Series | X6400 |
| 1/1/74 | Y Series | Y1200 |
| 1/1/75 | Y Series | Y6300 |
| 1/1/76 | Z Series | Z1100 |
| 1/1/77 | Z Series | Z5200 |
| 10/1/78 to date | A Series | A1000 |
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