You can learn more about your dishware by researching it yourself. Is it pottery or porcelain? Gently tap on the edge of the plate with your fingernail. Porcelain will produce a "ting" sound while pottery sounds like a quiet "thud."
When a piece of dishware has no maker's mark, the numbers may indicate the person who painted it (as piece work) or the item's pattern.
Try to find something similar on Google images. Describe the plate in as simple terms as possible. State shape, size, main color, pattern, and trim on the rim. As it is floral, state the type of flower in your description.
You can check out antique porcelain information with a book. Try Millers Porcelain Antiques Checklist by Paul Davidson or another like it. You can also take the plate to a dealer who specializes in old dishware. Tell them that you don't want to sell, just help with information. Expect to pay a fee but maybe not as much as with an official appraiser. Appraisals can be quite pricey.