Those are definitely Column II. And correct that those are non-original mids and tweets, which is unfortunate. The mids in Column II are directly from the Quantum series and the tweeters are excellent Motorola piezos that are, in my opinion, equally as good as EMITs. Note that there is also a matching rear-firing tweeter as well. If those have been replaced too, it would be very hard to find 4 original piezos.
With all that being said, Column II are excellent speakers in stock form and a fantastic example of early Infinity. My only issue with them is that they can produce TOO much bass. They have a downward firing, doped 10" woofer that really hits hard. They can be had for very little coin and represent amazing values in the used market. I sold my near mint pair that I refoamed and recapped for $400. That's a pretty good value considering they sold for $1,500 a pair in 1977, which is $6,500 in today's dollars.
So although I would normally recommend any Infinity lover to grab and listen to a pair of Column IIs, without the mids and tweets, these aren't really Column IIs anymore, so unless they were dirt cheap, I would probably pass and wait for a better example to come along.