Datsuns are sick cars however you didn't mention the mileage, price, and etc. Have a mechanic check it out and check for rust because Datsuns are notorious for rust and I would not pay a whole bunch of money. Get all the facts and ownership history, if it's all good, go ahead and buy it.

Those are a cool alternative to a period MG or Triumph for a weekend toy. Are you prepared to deal with the needs of a car that's over 50 years old? (It's not like working on a modern car. A young friend who bought a similar vintage TR6 found this out the hard wary.) Have a mechanic who understands old cars go over it, and as has been mentioned check carefully for RUST.