Am looking to identify the year of mfr for a Davenport serving dish. I have not been able to find the same pattern anywhere. The marks are as follows: The word “DAVENPORT” appears directly above the anchor, of which the bottom half has faded beyond seeing): the “N” is directly above the eyelet (which is also faded); directly above the “N” is the number 10; to the left of the “N” are the numbers (upside down) “1.86”, with the dot midway as in a date; to the right of the “N” is the inscription “Rd No. 30422”. The cover does not correctly fit the dish and there are repair marks. Please help to identify.