Hi Ron, Unfortunately the ship pictured on you're card is not the Titanic, its one of the Cunard ships, probably the Mauretania. This is a common problem with pictures of the Titanic- a lot of them are either of her sister Olympic or one of the cunard sisters(Mauretania/Lusitania).
In any case good luck with you're auction.
The vent cowlings tend to indicate that the ship is the Mauritania. That doesn't mean that it doesn't have a certain premium value. As Trevor indicated, the images of other ships were used quite frequently, and this was due to the fact that there weren't that many photos of the Titanic in circulation. With so few available, any four stacker would do, and few people would have been the wiser.
Not a very convincing hack job there, but as I indicated, precious few people outside the industry would have known the difference. Rivet counters like us who can tell the difference between sister ships on sight ( without looking at the name!) are very much the exception, not the rule.
This is the first time I've seen an attempt to pass Mauretania off as Titanic. I would have thought that it would have been more logical to have used a picture of Olympic instead, as there must have been plenty available. Usually, it was images of Lusitania that were passed off as her famous record-holding sister before WW1.
From Jeff Newman's collection on Great Ships, this page has another example of Mauretania being passed off as Titanic; look at the card in the third row. Not terribly uncommon; seems that any four-stacker could fit the bill.