IGM & DGM Numbers
The IGM number or for that matter the DGM number of a vehicle was issued by the Italian Government to all Italain vehicles. On an Italian frame number the IGM or DGM number appear after the frame number.
DGM means simply Direzione Generale Motorizzazione that is the main place where all the vehicles are tested and they get an homologation.
IGM means Ispettorato Generale Motorizzazione, and is actually the same thing. The following number is a progressive homologation number, and OM is for 'omologazione', homologation. Older vehicles have IGM, and more recent ones DGM: in 1967 the name was changed from 'Ispettorato' to 'Direzione', hence the two different abbreviations.
The following list is not comprehensive but is the information that the BLA has currently been able to amass:
| Model | Homologation |
| Open Frame - Shaft Driven | |
| Model A 125 | 183 |
| Model B 125 | Unknown |
| Model C 125 | 83 |
| Model D 125 | 221 |
| Model D 125 Derived from 150D | Unknown |
| Model D 150 | 403 |
| Model E 125 | 302 |
| Model F 125 | Unknown |
| Closed Frame – Shaft Driven | |
| Model LC 125 | 51 |
| Model LD 125 | 222 |
| Model LD Avv 125 | ? |
| Model LD 125 Derived from 150LD | ? |
| Model LD 150 | 448 |
| Model LD Avv 150 | ? |
| Model LD 125 '57 | ? |
| Model LD Avv 125 '57 | ? |
| Model LD 150 '57 | ? |
| Model LD Avv 150 '57 | ? |
| Closed Frame | |
| Series 1 Tv 175 | Unknown |
| Series 1 Li 125 | 1009/58/O |
| Series 1 Li 150 | 917/58/O |
| Series 2 Tv 175 | 1130/58/0 |
| Series 2 Li 125 | 0902 OM |
| Series 2 Li 150 | 0903 OM |
| Series 3 Tv 175 | 2515 OM |
| Series 3 Tv 200 | Unknown |
| Series 3 Li 125 | 0902 OM |
| Series 3 Li 150 | 0903 OM |
| Series 3 Li 125 Special | 4190 OM |
| Series 3 Li 150 Special | 3316 OM |
| Series 3 Li 150 Silver Special | |
| Series 3 Li 150 Golden Special | |
| Series 3 X150 Special | 4770 OM |
| Series 3 X200 Special | 4355 OM |
| Series 4 Li 125 | 0902 OM |
| Dl 125 | 6439 OM |
| Dl 125 Eectronic (No Examples Known) | |
| Dl 150 | 6437 OM |
| Dl 150 Eectronic (No Examples Known) | |
| Dl 200 | 6441 OM |
| Dl 200 Electronic | |
| Junior Range | |
| i50 | 3687 OM |
| i50 Special | 5520 OM |
| i50 De Luxe | 5520 OM |
| i100 Cento | 3484 OM |
| I125/3m | 3689 OM |
| I125/4m Star Stream | 3689 OM |
| Luna Line | |
| Lui 50C | 5629 OM |
| Lui 50CL | |
| Lui 50S | |
| Lui 75S | 6126 OM |
| Lui 75SL | |
| Open Frame - Shaft Driven – Front Box | |
| FB 125cc | 141 |
| FC 125cc | 113 |
| Open Frame - Shaft Driven – Rear Box | |
| FD 125 Mk1 | 3291 |
| FD 125 Mk2 | |
| FD 150 Mk2 | 454 |
| FD 150 Mk3 | |
| Small Round Cabin – Shaft Drive – Rear Box | |
| FD/C 150 | ? |
| FD/C 150 Moto Giardinetta (Rear Seating) | |
| Small Round Cabin – Rear Box | |
| FLI 175 Series 1 | 1329/59/0 |
| Large Round Cabin – Rear Box | |
| FLI 175 Series 2 | ? |
| Lambro 175 | ? |
| Lambro 125 (125cc) (French Market) | ? |
| Lambro 450 (175cc) | 4188 OM |
| Lambro 450 (125cc) (French Market) | |
| Lambro 500 L (175cc) | 5059 OM? |
| Lambro 200 (200cc) | 3102 OM |
| Lambro 550 (200cc) | 4125 OM |
| Lambro 550 (200cc) (Export) | 4125 OM |
| Lambro 550 ROMA (200cc) | |
| Lambro 550 N (200cc) | 5006 OM |
| Lambro 550 A (200cc) | 5006 OM |
| Square Cabin – Rear Box | |
| Lambro 550 M (200cc) | 6322 OM |
| Lambro 550 V (200cc) | 6320 OM |
| Lambro 550 ML (175cc) | ? |
| Lambro 550 ML (200cc) | ? |
| Lambro 500 ML (200cc) | ? |
| Lambro 500 ML (175cc) | 7322 OM |
| Lambro 500 ML (125cc) (French Market) | ? |
| Lambro 600 M (200cc) | 6370 OM |
| Lambro 600 V (200cc) | 6370 OM |
| Closed Frame – Front Passenger Seating | |
| Tri Lambretta 200cc | ? |
| Autocycle | |
| Lambretta 48 mk1 (48cc) | ? |
| Lambretta 48 mk2 (48cc) | ? |
| Lambrettino (39cc) | 4837 OM |
| Lambrettino Debramatic (39cc) | 7034 OM |
| Lambrettino SX (48cc) | 5353 OM |
| Lambrettino SX Automatic (48cc) | 5351 OM |