420s
420s ke ngwagasome tšhupamabakeng ya Gregorian wa go thoma ka 1 Pherekgong 420 ya fela ka 31 Manthole 429. Ngwagasome 420s o wela ngwagengkgolo wa 5.
| Ngwagakete: | Ngwagakete 1 |
| Mengwagakgolo: | Ngwagakgolo 4 – Ngwagakgolo 5 – Ngwagakgolo 6 |
| Mengwagasome: | 390s 400s 410s – 420s – 430s 440s 450s |
| Mengwaga: | 420 421 422 423 424 425 426 427 428 429 |
| 420s-tšago tswalanya: |