Wiinblad-like pottery - STUCKI Jakob, Langnau (Switzerland)

I would appreciate any help in identifying the mark on a couple of pieces I have acquired. I have a plate and platter from the same maker's mark. The plate shares characteristics of Bjorn Wiinblad and the platter is very well done. I believe these are Scandinavian and mid century but despite my best efforts I have not been able to identify the marks. Both pieces share the same stylized pine tree/chevron and "iST" mark. These are fantastic pieces for my collection and I would love any help that you can provide identifying the maker.

Thank you, Bob

STUCKI Jakob, Langnau Suisse

Thank you very much for the quick reply. It is great to know where these pieces came from and it gives me an opportunity to appreciate other pieces from the same potter. Thank you again.