| Nominative | pecet |
| Genitive | peceta |
| Dative | pecetowi |
| Accusative | pecet; peceta |
| Instrumental | pecetem |
| Locative | pececie |
| Vocative | pececie |
| Nominative | pecety |
| Genitive | pecetów |
| Dative | pecetom |
| Accusative | pecety |
| Instrumental | pecetami |
| Locative | pecetach |
| Vocative | pecety |