.32 SN 619xxx - 1955 I frame?

[-BTM-]

Trying to figure this out, looking at just a cylinder for sale. If I am looking at this correctly it appears to be from a pre-model 30. Does that sound right? I'm on the hunt for .32 parts.

 

[two-bit cowboy]

Could be a .32 Hand Ejector as you suspect, or it could be from a
.32 Regulation Police, the square butt version.