Cobalt blue Porcelain teacup and saucer

A

A cobalt blue & white porcelain teacup & saucer, possibly dating from the late 18th or early 19th century. It has a very unusual pattern that is mostly geometric but also with some leaf shapes. Printed crown backstamp on underside of cup, impressed crown backstamp on underside of saucer with letters below ?H?O, possibly LHSO.

It does not seem to match anything from early English porcelain makers such as Longton Hall, Liverpool, Chelsea, Lowestoft etc. I would be very grateful if anyone could me a clue as to who made it and when, or even which country it was made in.

Poor