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| Title | U.S. Stamped Envelope Agency [Hartford, Conn.] |
| FormNumber | 3220 |
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| WhereUsed | Packing slip and receipt to accompany a shipment from the Agency to a postmaster |
| EKU | 1888 Feb. 21 RGR |
| LKU | Dec. 1962 ASW |
| Notes | appears to have been used with Special Request Envelopes |
| Source | SS |
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