NOS Ymos ignition lock and key. You can see the condition of the cylinder and lack of scratches where the key inserts. The key is also as delivered with the code of HM3212 band on it.

This is 1.5 inches long. I haven’t determined what it fits but it’s not a W123,124 or 126. Match up the locking tooth on the side and the other photos.

Don’t waist your time and money on the cheap aftermarket ignition cylinders with the tiny teeth inside. It’s only a matter of time before they fail.