Victorian-home owners had different ways to raise their sash windows. One method was with an embedded piece of hardware such as this one, which allowed the user to insert three fingers and lift. This sash lift dates from about 1870 to 1890. It has an Eastlake pattern.
The sash lift appears to be made out of cast bronze. It measures 3 inches across and 1 3/4 inches vertically. The finger depth is 5/8 inch. The lift is secured into place with two screws, one at each end of the inside indention.
Screws are included.