
The ERA No. 4 Window Key typically refers to the ERA 804 window lock key.
ERA uses a standardised numbering system for its classic window locks, where a single standard cylinder/peg key operates a series of different locks. Including models 801, 802, 803, 804, 853, and 854.
Information and illustrations are to the best of our knowledge and sourced from various sources. if you know differently, you are welcome to message us.