| Answer | Crossword Clue |
|---|---|
| POB | Envelope abbr. preceding a number |
| APT | Envelope abbr. before a number and a letter |
| ESTD | Abbr. preceding a date |
| ESTD | Abbr. preceding a year |
| ESTAB | Abbr. usually preceding a year |
| ATTN | Abbr. on a business envelope |
| MME | Abbr. on a French envelope |
| MLLE | Abbr. on a French envelope |
| RFD | Abbr. on a Mayberry envelope |
| ATTN | Abbr. on a business envelope, perhaps |
| ATTN | Envelope abbr. before a contact name |
| ATTN | Abbr. before a name on an envelope |
