The Deacon has it right (as usual). The current Police 3, is very similar to the classic C54 Calypso, slightly less belly, slightly straighter spine, slightly larger overall, and the handle shape is straighter. If you do a search for picture request c54 calypso, you'll be able to find some useful pics. Change the handle shape slightly and add a lanyard hole (present in the C54, missing in the current G10 Police3) and it pretty much would be a C54.5. Haven't carried my C54 in years, but should pull the trigger on the Police3 to see if it can compete with the ZDP Stretch2 for my "big knife" starting spot.
I do admit that nothing compares to the elegant curves of the original.