You've got the long handled model. The short handle version is under 4 inches overall. My picture shows, left to right, a Digress long-handle adaptation with brass knob, centre the standard short Progress with my red dot addition, and right, the short handle Mergress conversion with stainless knob.
The actual handle lengths, measuring only the fixed metal from beneath the baseplate to where the movable adjusting rings/knob start, are 2 7/8 " for the long, and 2 1/4" the short. The Digress conversion makes the handle length overall 4", and the Mergress 3 3/4".
There are no distinguishing markings on the razors for size, and I can't remember what was on the box or packaging.