From source: "Both sides of a sample postcard placed inside Coast and Geodetic Survey drift bottles. When released, the ship's name, location and date of release, and the bottle number were stamped or handwritten on the card. Photo credit: NOAA."
<a href="https://en.wikipedia.org/wiki/National_Oceanic_and_Atmospheric_Administration" class="extiw" title="w:National Oceanic and Atmospheric Administration">w:National Oceanic and Atmospheric Administration</a> (NOAA)
<p>URL: <a rel="nofollow" class="external free" href="http://www.nefsc.noaa.gov/news/features/mv_bottle/">http://www.nefsc.noaa.gov/news/features/mv_bottle/</a>
Archive: <a rel="nofollow" class="external free" href="https://web.archive.org/web/20150210235757/http://www.nefsc.noaa.gov/news/features/mv_bottle">https://web.archive.org/web/20150210235757/http://www.nefsc.noaa.gov/news/features/mv_bottle</a>
</p>
"Both sides of a sample postcard placed inside Coast and Geodetic Survey drift bottles. When released, the ship's name, location and date of release, and the bottle number were stamped or handwritten on the card. Photo credit: NOAA."