It would really be best if you can post images of the front of a plate or platter and examples of all the backstamps, either directly on this Message Board or on a third party site where we can view them. Guidance is at the top of the Board.
The printed mark appears to be the one in use from 1920 to 1960 and the impressed 50 should be a date mark, so there should be a letter impressed above it?
As to whether the pattern number is 1/7200 or 1/9200 (or 7200 or 9200 etc.)is crucial and we may be able to take an informed view as to the correct pattern number,if you post various examples of the pattern number from the china you have.
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