The Adolfhutte bei Winterberg white cup with blue overlay has the same cut circles and gilded line in the centre of the spiral cuts. Excellent spot flying free thank you.
This mug on Pinterest is also a uranium green over opaque white:
https://cz.pinterest.com/pin/490540584416192354/I would not describe the pontil mark as oversized, definitely not as large as the wide polished pontil marks found on some Stevens & Williams wares.