I am trying to get a rough idea of what this set is worth, on the back it was an anchor marking and it also says Gustafsberg Venus… I cannot locate that specific wording in association with the set anywhere. any info would be greatly appreciated, the back does have what looks like a year 1917 and I know it’s Swedish. My mother in law is selling her home and wanted to sell it but we cannot seem to find online in order to obtain an educated starting price. please please help. TIA