Posted By:
fkwIts a good question because the single card cut from the Postcard and a Mini are the exact same size and if cut right they will look the same.
The easiest way to tell yours is the true W517 Mini, is the left and right borders are fairly large. From the few postcards Ive seen (I own 1), I have yet to see one that has a thick border all the way around outside edge. They all have no or very little white showing around the edges.
The stock of the Postcard and Mini are the same thickness, but the postcard seems to be made of a higher qualty stock and has a slightly smoother surface front and back. The printing on the postcard is also of slightly higher quality, but not enough to tell unless you have both to compare. If the postcard was cut, only 1 of the 4 cards would be blank backed. The other 3 would have parts of the "Post Card" design on back.