Original key taken from a Gustav Becker clock. Clockwork is marked P42. It has come to our attention that the P42 clockwork uses 2 different Keys. Best is to measure the axe and give the size so we can send the correct key. Key you receive may not look like the one in the picture that is a stock photo. WE HAVE ANTIQUE KEYS AND NEW KEYS, WE SEND WHAT IS AVAILABLE MAY BE AN OLD KEY WITH SIGNS OF USE.