Yes they certainly have a value and the older they are the more sort after. Difficult to give you price guidance. Depends as Mark says on how scare the card is and also condition. I have been selling cards on ebay for awhile and there is a strong market for this type of item.
I am afraid, that I am a believer in the story that the Olympic is the wreck lying at the bottom of the Atlantic, not the original Titanic.
According to reports I have seen, the damage caused in the collision with the cruiser was so severe that Olympic was considered to be too expensive to repair. She was therefore substituted by her sister Titanic, and it was she who was sunk in the collision with the iceberg not the Titanic.
Jobs were so valuable in those days, that the workers chosen to swop the identities of the two ships were promised a job for life if they remained loyal and did not disclose what happened.
I cannot see how a ship damaged as severely as Olympic was, could have carried on as long as she did. I appreciate that the I.D. number of Titanic was found on the prop of the wreck, but whose to say the props were not changed.
As an ordinary member with no knowledge of Titanic/Olympic/Gigantic/Britanic whatsoever I declare that I wholeheartedly agree with Benjidog. If there is any one thing that needs to be avoided it is that subject, if possible, please.
It is a THEORY! Nuff sed.