Hello and welcome! My name is Doris.I have been an antiques collector, dealer and appraiser for over 56 years.I will be pleased to help you.
I can tell you what the crown/Damark/3 Squall lines but the numbers and other marks represent the artisan and studio plus the factory blank (white porcelain) that was used to make the platter. I cannot tell any names for the numbers or the second squall line near the edge.
Would date range and meaning of the crown.Danmark, 3 squall lines mean be enough for you? I can value your platter as well if you give the dimensions.
Let me know.