Originally Posted by
WisTex
In fact, despite the fact that your card has a MasterCard logo on the front, if you try to use it overseas at a merchant that ONLY accepted MasterCard but not Diners Club, your card will be declined.
Citation for this assertion, please. I am certain that I have used my Diners Club card since the changeover to the MasterCard logo outside the US and Canada. I admit I cannot attest to whether all the merchants accepted MasterCard and not Diners Club.
My understanding was that non-North American Diners Club cards were
not usable on the MasterCard network (but usable on the Diners Club International network), while North American Diners Club cards were available anywhere in the world MasterCard was accepted. The NA Diners Club cards start with a "5" and "look" like a MasterCard, while the non-NA Diners Club cards start with a "3" and "look" like an (old) Diners Club card.