Hi,
I suspect you have a saucer without it's tea cup possibly Swiss but more likely Bohemian, the Swiss ones have a particular type of decoration , this 1 to me is more Bohemian in style ,but by no means 100% certain
A Swiss one ,mid 18th c
http://www.cmog.org/artwork/teacup-and-saucer-2and a probably Bohemian example with decoration more like yours ,
http://www.cmog.org/artwork/teacup-and-saucer-enameled-floral-bouquetsand 1 of mine,Swiss, below.
cheers ,
Peter
found this to add ,regarding what the glassmakers were trying to achieve with these pieces
http://www.cmog.org/article/east-meets-west,
quote
From Venice, the secrets of glassmaking were carried north.21 Although this is well known and much studied in connection with the stylistic and technical properties of cristallo and an international fascination with imitating this type of glass, the production in Switzerland of milk glass resembling porcelain by glassmakers of Venetian origin and training is less established.22 Archeological excavations around the former Südel glasshouse in Flühli, near Lucerne, unearthed fragments of a porcelainlike lattimo of sophisticated craftsmanship and decorated with a feather design that are datable to about 1723 to 1760. They facilitate the attribution of intact objects in this style (^^79.3.277^^ and ^^79.3.340^^).23 This form of decoration may be unique to glasshouses in Flühli, but figural motifs, such as those that are generally affiliated with decorative styles in Bohemia, characterize a second group of Südel glasses.24 Interestingly, this glass is comparatively translucent and so reminiscent both of Chinese porcelain and of its imitations, such as Bohemian milk glass. Thus the Swiss production appears to reflect geographically divergent influences, including Venetian technical skill, a particular batch formula, and figural iconography related to northern traditions.25