French opalines tend to be bright colours in solid material, with heavy feet & polished out pontil marks, ormolu mounts, gilding etc. while the Czech variety is mould blown with a broken pontil. The colours are often drab, milk coffee like and the painting was done in cottage industries, not the professional workshop so you get a wide divergence in quality. There is no comparison, really. As for Moser, that seems to be american slang for "czech" - I am sure they will deny all involvement.