| Year | 1939 |
| Weapon Type | Light Anti-Aircraft Gun |
| Origin & Designer | Switzerland/Oerlikon |
| Numbers Produced | 170 |
| Crew | 4 |
| Calibre | 20mm (20x110RB) |
| Elevation | -15° to +85° |
| Traverse | 360° |
| Breech | [@breech] |
| Recoil | Spring |
| Gun Sight | Ring Sight |
| Gun Mount | Tri-Pod |
| Carriage | Two Wheeled Carriage |
| Trailers | [@trailers] |
| Gun Shield | [@gun_shield] |
| Armoured Plate | [@armoured_plate] |
| Barrel Length | 2.240mm (L/65) |
| Overall Length | [@length] |
| Width | [@width] |
| Height | [@height] |
| Weight | Weight in Traction: 363 kg Weight in Action: 291 kg |
| Round Weight | 0.125 kg (HE) |
| Muzzle Velocity | 830 m/s |
| Feed | 30 Round Drum Magazine |
| Magazine Capacity | [@magazine_capacity] |
| Practical Rate of Fire | 180 r.p.m. |
| Rate of Fire | [@rate_of_fire] |
| Maximum Rate of Fire | 450 r.p.m. |
| Maximum Ceiling | 1.800m |
| Maximum Ground Range | 2.500m |
| Maximum Range | [@maximum_range] |
| Armour Penetration | [@armour_penetration] |
| Traction | Motorised |
| Variants | [@variants] |
| Notes | The TL 1 was the Dutch name for the Oerlikon 20mm light anti-aircraft canon. The Oerlikon was a fine anti-aircraft gun which was excellent in providing cover from low flying aircraft. The Dutch army place an order for these weapons in 1939 and 170 were delivered, these were issued to light anti-aircraft companies located in infantry divisions and volunteer formations. |