ID on Japanese backstamp please...

Yes, it's me again. Asking the learned for advice on identifying & dating this hand-painted platter. It's roughly 11" long, 5" wide. As most of my finds, this one came from an estate sale. The seller mentioned that this was used by their family in the 1950s, so has some age on it. A while ago I had a lengthy hunt for the backstamp via Google images and a good trowel through the Japanese marks section at Gotheborg, and came up empty handed.
Defeat now admitted....

 

You looked at the mark images under 20th c on gotheborg, right? Rather a distinctive mark. Google lens is no help. Dang.

 

I'm amazed Google lens doesn't show it either. I've found sort of similar. Crown plumage etc but nothing close. I guess 20th C. Japanese is kind of pretty much of a muchness though. Prob pre 1945 as it says Japan but other than that no idea.

 

Yes. Also tried a search at the Japanese Trademark Office to no avail (not overly familiar with how to search that database).

 

There are two ebay items that have this mark (as at 29 Aug 2025): 186703856737 and 375546645528. Both sellers mention their items are in a Royal Doulton "style", so I went through the RD section at Replacements. Again, no matches.

 

Well, last resort may be the Asian Arts forum (your query may or may not be answered) or if you are on Facebook there are likely several Japanese porcelain and pottery groups that might help. If you do discover the factory, please come back and update this thread, thanks.