That particular boat looks as though it has been heavily modified - The "doghouse" aft of the mast
is almost certainly a retrofit.
I expect that the boat was designed and built as an IOR half-tonner, as a pure racing
boat. As such, Holland drew some nice boats. But taking an IOR half-tonner as a live-aboard cruiser does have some challanges. Not so say those challenges need to be "deal-breakers", but if you are not familiar with this era of racing boat, you may wish to do some homework. Great price