As you probably know, your set was made by Boch Keramis located in La Louviere, Belgium and in France.
The firm was established in 1841 and ceased production in 1998.
There are various marks on your pieces but they all seem to date before 1973.
The blue and white pattern name is Copenhague.
My research indicates that your set of pieces in this pattern has a retail vintage store value of $870-950 assuming good condition.
Online auctions like eBay generally bring wholesale selling prices.
If you would like to sell close to retail , some ideas are:
The internet has your largest audience of buyers. Place small ads on these sites or set up your own small store on these sites.
Etsy.com - small fees - 20 cents to list plus 3.5% final price.
Amazon Marketplace: http://services.amazon.com/content/sell-on-amazon.htm/ref=footer_soa?ld=AZFSSOA
These sites are excellent and more upscale but fees are higher. I only recommend them if you have several items to sell.
A private seller to a dealer or at auction can expect 30-60% of retail value.
I hope I have helped you.
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