Assuming that it is the vintage floral you are looking for, there is lots of discussion about Floral 22s elsewhere in this forum, which you should read carefully before you think of investing! However, I think I can sum up the salient points for you.
There was only one model produced, which is the 22, a smallish pen, not surprisingly designed primarily for the lady user. The Floral 22 owes a lot of its appeal to the books by Andreas Lambrou that stated only 200 were ever made. In fact, the pen was offered in price lists for about 2 years in the mid 1950s, and though it seems only one batch was made because the material was difficult to handle, this batch produced more like 2000 pieces. They are therefore not all that uncommon. However, the material is subject to rapid and irreversible discolouration, especially if inked, which turns the lovely cream background into a horrible mustard yellow. Do not therefore expect to use such a pen on a regular basis!
Because of this, pieces in prime condition are reasonably rare and probably worth buying. However, discoloured pieces also fetch silly money (because of the Lambrou effect described above) and these are a complete waste of money at any price, as far as most contributors to this forum feel. Because of the demand, prices for good examples are high. Expect to pay in excess of £350 (GB pounds sterling) and maybe as much as £550 for an excellent example on ebay, up to £750 from a dealer. These pens are regularly offered on ebay, though there have been none for quite a few months now, and obviously you have to be wary of condition. This is a good mint example currently on offer at Writetime for you to buy today at £695!
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If you wanted to pay a bit more for a mint, price stickered version, I could probably find you one available for about £800! I believe a few were also sold in a special box but I have only ever heard of one of these on the market.
Of course if you are interested in the modern Conway Stewart floral, this is a very poor imitation of the original in solid 18k white gold, which sells for around £12000, I believe!
Hope all this helps!
Andy