Featured Early Mason's platter

I try very hard not to buy any porcelain/pottery, unless it is in perfect condition, early or it has bugs on it. This one has wear (but no chips, cracks or roughness) but has a butterfly, plus I think its an early Mason's so I had to buy it (the price helped too). Size about 15-1/2 by 12 inch. I'm reading that the impressed mark in a straight line (Mason's Patent Ironstone China) without the blue stamp is early. Is that always true? If so date range and anything more about the pattern? (Hopefully you can see the stamp in the last pic; I tried cinnamon but it didn't help so I gave up).

 

pretty platter !!!

 

This doesn't answer your question but I did find a smaller example of this pattern with a different mark if you haven't seen it already.
https://www.liveauctioneers.com/item/79801498_two-colorful-19th-century-small-octagonal-ironstone

 

(I'd have bought it too, I love it!)

 

Ouch. I hate those metal spring holders. They stress the porcelain.

 

And yet it sold $275 for both platters.

 

Mark 3

Impressed in one line 'Mason's Patent Ironstone China'
C.1813-20

 

Great info, thanks all!

 

Blimey, I wish I could get that money here. It's polychrome decorated transferware. I agree on early: Godden says 1813 to 25. The one with the printed mark is a fair bit later.