Rare John Pearson large copper bowl

Quite simply one of the best pieces of John Pearson metalware we have come across.
A superb and very well patinated & large, deep dish/bowl showing him at his most fanciful, with real and mythical creatures that he is best renowned for; fish, snakes, flora and other unknown beasties!
Curiously and apparently unmarked (does happen occasionally with his pieces - could have been a commissioned piece) but difficult to see under all the patination, so may be very lightly incised to back.

Just under 19" in diameter and just over 2.5" high/deep.
c1890.