recognize this Nikkormat?

[Sumarongi]

... what does the white protrusion do? Is it the shutter speed selector, somehow modified?

 

[bherman]

I believe that it is the original Nikkormat FTN. My dad had one

 

[Sumarongi]

I believe that it is the original Nikkormat FTN. My dad had one

No, because the FTn would have a Judas window for the shutter speeds —— not present here, IMHO.