The inside diameter of the seatpost is 26.0mm but the outside diameter is only 27.5mm which is a touch smaller than the seatpost on my French built Peugeot PR10. The outside diameter of the downtube and toptube is 29.0 and 25.0mm respectively so a combination of English or French sized tubing? I guess the Spanish had their own sized tubes and lugs going on, or at least Torrot did. An enigma wrapped in a palindrome
The steerer tube takes a regular 22.2mm stem