Was it the watch?
You charged 87p postage - if that is all you put on, it will have been held up because of having insufficient postage on it.
87p is the postage for a letter - a flat envelope with very slim contents such as a folded letter.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)