Hallmarked Rindskopf and Kralik (?) blue tango - 1929

The London hallmark on the left-hand vase is 1929. Amazingly modern in style, and anticipatory, I understand that this décor was in production for around 20 years prior.

The shape of the one on the left is a Rindskopf shape. I have an aventurine feather in exactly this shape and size. As for the one on the right, I am still going with Kralik but mindful a year down the line of Kevin's pointers to Tomschick and who knows what other producers!