This is a  Polaroid #218 lens/shutter for view camera use.  I believe it covers 4 X 5.  Comes with the cover of it's original box. Shutter speeds T, B, 1-125th sec. sound "snappy" and correct but untested for accuracy.  This is a self-cocking shutter and can be fired with the supplied cable release.  Has PC synch as well.  The glass in the Tominon f4.5 looks real nice with no issues.  Comes mounted to a metal lens board measuring 3 1/4 X 31/4. Plastic lens cap included.  Free shipping in US.