1954 US FDC Addressed To Cuba With 3¢ Postage?

This 1954 U.S. FDC addressed to Cuba was, despite the damage, far too appealing to pass up when I saw it on Delcampe.





I ordered it from a seller in Spain, and as an excellent bonus, I quite like the cover that it shipped in, too.





But I'm wondering: how did it get to Cuba with postage equal to the 1954 domestic letter rate? Letter rate to Cuba was 8¢ at the time.





Anyone know?

Is it possible that the FDC was originally purchased unaddressed. And then the name/address were typed on it to show owner, but never actually mailed?

Don't know about back in the 1950s, but at least in the 1970s through 1990s, there would be companies that provided FDCs either directly to collectors or as souvenirs for businesses to give to clients. You could obtain them either unaddressed or addressed, but they actually never went through the mail system.

Are there any other postmarks on the back?

Hmm, khj. That's a very plausible explanation.

No postal markings, front or back, other than the FDOI postmark, which would tend to support your hypothesis.

FDCs of this period mailed internationally carry a premium but only if backstamped. Otherwise as per khj's explanation.

It seems unlikely that it was carried in the mail stream, but also odd that it is torn on the end, as if opened to remove a letter. But I don't think it has to be that the addressed was added later.

It is too bad that there's no backstamp; you hope to see that in an FDC addressed to a foreign destination. I don't have my rate books at the office but believe Cuba was part of the treaty rather with other Latin American/Spanish sphere countries at the time and entitled to reduced postage (that's the table in the image you clipped).