From the 18th century small concealable pistols for self protection, were manufactured in Europe in large numbers. The picture shows a flintlock example manufactured in 1820 from Birmingham England.
Measuring just over 4 inches (11.8cm) these lightweight guns were intended mainly for women. As they could easily be concealed in a Ladies hand warmer, they gained the name of Muff pistols.
Like many of this type of weapon it is fitted with a sliding safety catch to prevent accidental discharge.
Seems it would be uncomfortable to carry it 'there' LOL !