There are a lot of Different versions of the V672 but I'm Assuming we talk about the first one.
Electrically (from a quick glance at the Schematics) the V672 is a bit more modern. It has a less rudimentary Powercircuit and the input Preamplifier is a bit more complex. Just by looking at the schematics i would say the 272 would be the more "Vintage sounding" unit.