RS Prussian tea cups

A pair of fine transparent Prussian tea cups and saucers. Unusual mould used and have square bottoms to the cups. The decor is of the more common floral designs but so ornate. We've done the usual checks and are convinced they're not reproduction. The stamp is not raised in any way and also seems genuine. What concerns us is only one price is marked. Have looked into forgeries and these cups seem very genuine. Would like other opinions and maybe a value put on them. 

Excellent