Here’s living proof that you need to check cards carefully if you are serious about acquiring.  We have two of these Asheville Post Card Co. linen cards available, both unused, and both bearing index numbers N-781 and E-4456 on the front.  But on the reverse, one has a long caption (Grade: 3, $1) and one has no caption at all (Grade: 3, $1).  For the oddity, have them both for $1.50.