Just curious: We're remodeling and updating our 1929 kitchen, and restoring the original casement windows. On all the downstairs windows in the house, there are two locks like these. (Upstairs, there are only locks on the left side of each pair of windows, which is the side you can't open until the right side is open first.) These have been stripped of paint.

Just wondering if anyone has a guess why there would be two different locks (consistently throughout the downstairs) like this? The lock on the left is slightly longer. Would the locks on the right have been added to the downstairs windows at a later time, and perhaps the owners couldn't find matching hardware? Can't imagine this asymmetry was the preferred look, given the meticulous attention to other detail in the house.

Any theories welcome. Thanks in advance!