One of key like shown (see our other listing for full octave notched and flat keys) This is the far Right key that is unlike the others in that it has no notch in side for a black key. Harder to find since these organs only have one on each manual. From Conn 633 Serenade but also fits many other Conn organs as they used these keys in a lot of models. so if yours has broken keys, See picture and compare. If you are not familiar with installation, there is a dab of flexible glue holding the end of the metal bracket in place to a rail (and the brass tab is held under it with light tension), and with some effort and slight sideways wiggle movement you can generally simply pull the key forward and pull free,(or can cut glue with knife or solvent if you have trouble) Then slide in the new key and add some silicone or other type semi-flexible glue at the rail. Brass tension tabs is included in case you need Felt pads on bottom are there too, you may need to add a new dab of glue if pad is not tight. Also if new key does not push in easily, you can take some pliers and flatten/straighten the end as there may be slight bend in it. Last picture shows how it sets in the organ rail (but of course that rail is not included)