These date from the early 1870's. It is mounted where the two sashes meet. Pull the handle down and the sashes are pushed together to eliminate a gap. Raise the window a bit and it will hold it open at any level. It also locks it into place. This lock is also ideal when the two sashes do not line up.
Available in Lacquered Brass, Unlacquered Brass, hand antiqued brass, Oil Rubbed Bronze, Polished Nickel, and Brushed Nickel
Banjo Window Sash Lock #3917.USXXX
US3 Polished Lacquered Brass
US3A Unlacquered Brass
US7 Hand Antiqued Brass
US10B Oil Rubbed Bronze
US14 Polished Nickel
US14B Brushed Nickel
Great for rattling or uneven windows
This is mounted where the two sashes meet. The first example picture shows the banjo mounted and the foot not touching the sashes which are free to move. 2nd picture is with the handle dropped and the foot pressed against the sashes. This eliminates rattle, closes the air gap, and locks the sashes into place. 3rd picture the sash is open and is held in position with the foot.