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| Title | Return Receipt (International) as a postal card |
| FormNumber | 3870 |
| Revision | c1923 |
| Division | |
| WhereUsed | originally prepared only in Foreign exchange offices; then other postmasters "specially authorized" were added; finally in 1932 PL&R 1st, 2nd, & 3rd class offices - 4th class still sent to the exchange offices |
| EKU | 1918 ASW |
| LKU | 1936 DLS |
| Notes | the function is described in the 1879 PL&R - earliest seen with a form number in the 1890s - initially a sheet of pink paper, by at least 1923 had been converted to a postal card; replaced in 1932? by Form 2865 |
| Source | SS |
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