Miniature Bark Pottery Bowl w Landscape by RT

We have enjoyed this small bowl for a few years, but have not been able to find the maker. It measures 1 1/4"h x 3 1/2" open x 1" base. Exterior bark texture no glaze, interior landscape with large moon with shiny glaze. Colors are a pale green, celedon and hunter green. Mark is the letters or initials R T embossed within an impressed circle. The letter R slightly lower than the T. Hoping someone will recognise the maker.

Thanks,
Eddie