This card was picked up as part of an album of postcards at an estate sale from an antique store owner in Northern California. Most cards were mailed by a couple of world travelers from the 1920's thru 1950's.
This one was postmared from San Juan, Puerto Rico in 1930. The age & stamp caught my attention as I disassembled the album because it contained acidic paper. When I examinrd it, I noticed that the corners were marred by semi-cicular marks, apparently from hole reinforcers with adhesive.
The card says it was made in Germany, but published in PR.
I'd like to know what the card & stamp are worth.