Thanks Burton Coggles. From the description given on the Vintage Guitar link my Tiesco is a '61 PE-51. I bought it S/H for 20 Pounds (Aust)in 1964. Wonder what it's worth now? Not that I'm selling.
Now I just have to find those missing 2nd and 3rd verses of Route 66 I heard on record years ago. Even Mudcatters couldn't find them last time round...
John