Featured Drip glaze leaf dish with faint signature - anyone recognise it?

Hi all, here’s another piece of drip glaze pottery I’ve bought that I can’t yet identify. Has a painted or stamped signature with a box around it - can’t make it out although looks like one word on top of another…maybe?
Number looks like 851 or 551. Was sold to me as 1950s but I’m thinking earlier….? Measures 26cm x 21cm.nice green and brown/gold colours. Anyone recognise it or the signature? Many thanks.

 

I’m thinking art nouveau period, maybe French?? Could be the artist’s signature, maybe the box is elongated letters. This one has me stumped so any help appreciated.

 

Thought it looked a bit like Alphonse Cytere but could not find a match to that shape of mark.

 

Yes can see the style but agree no shape or signature match. Could be from anywhere of course but the painted number and signature plus style looks European to my eye

 

I know this is probably off the wall, but it reminds me of Monterey Jade.

 

The colors somewhat remind me of Frankoma but I doubt it is that.

 

That too, Pearls.

 

All good suggestions and appreciated - alas I don’t think it’s those sadly