There is a mark on the bottom. It looks like a seahorse but it is very faint. There is some crazing on the back side of the platter but none on the front.
There is a small chip in the underside at the end of the platter. I really know nothing about the platter other then it has been in our family for years. The item "RARE ANTIQUE VICTORIAN PORCELIAN 21 Fish Platter Blue White Gold Hand Painted" is in sale since Sunday, November 9, 2014.
This item is in the category "Antiques\Decorative Arts\Ceramics & Porcelain\Platters & Trays". The seller is "vintageworldwidemarket" and is located in Riverside, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Panama, Jamaica, Egypt, Peru, Pakistan, Viet nam, Uruguay.