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It does appear to be the Sauser family crest. Here are some colour versions:
As you can see, the design consists of two trefoils (i.e. clovers), growing from a trimount (i.e. a mount of three hillocks), on a blue blackground. The crossed-seven-esque sign in gold appears to be a hausmarke.
The trefoils are a symbol for perpetuity. As a side note, green shamrocks are also symbol device of Ireland (often depicted with heart-shaped petals). While not the case here, they are particularly common in the crests of emigrant Irish families, symbolising their ancestral home.
The trimount straightforwardly represents three mountains, and has also been interpreted to symbolise the Holy Trinity. It is a relatively common element in Swiss heraldry, which may represent Mont Blanc, the Eiger, and the Matterhorn. But the design is also found in the rest of Europe, for instance on the arms of Slovakia where it symbolises the Tatra, the Fatra, and the MΓ‘tra.
In fact, the arms of Sigriswil, where the family was in, also features the trimount:
Coats of arms was essentially a form of personal or family identification.It was generally a mark of the nobility, but can also be granted without ennoblement or freely assumed. In the latter cases it might represent a luxury or a higher social status than peasants. Specifically, in Switzerland, just about everyone possessed arms.
Nearly every bourgeois and farming family in Switzerland seems to have a coat of arms.
- Fearn, Jacqueline. Discovering Heraldry. Gramercy Pub. Co., 1980. Print.