Porcelain Set Bearing The Beauvau-créon Family Coat Of Arms. 19th Century.

A porcelain set consisting of two shallow bowls or navette-shaped cups and a "litron" cup with a footed stem and its saucer. 

Each piece bears the coat of arms of the Beauvau-Créon family?
"Argent, four lion cubs gules, armed, langued, and crowned or."

The central shield has a white background, bearing four crowned red lions—with gold claws and crowns—arranged in pairs, surmounted by an imposing gold and purple crown draped with a matching purple velvet mantling lined with ermine. Wide gold borders. 
No maker’s mark; only a single letter under each piece and numbers—37? Or 31?—under the saucer (marks of the modeler or turner).

Condition: chips, some wear on the gilding (see photos).
Cup and saucer; gilding worn on the saucer, a large section missing, and a slight chip on the underside (see photos).
Cup: gilding missing on the lower rim; handle and upper rim in good condition. (See photos)

Dimensions:
Cup: height = 6 cm, diameter = 6 cm.
Saucer, diameter = 12 cm.
Saucers: 25.5 x 11.7 cm