I have a very high number,late production 1969 XLCH. The date code on the frame looks like 0 L. Hmmmm. A closer examination . The 'O' seems to be a 9 without the tail. The indentation on the upper edge of the 'O' is deeper than the bottom edge as if the stamp was at an angle. It's definitely a classic CH frame- straight rear down tubes. It seems unlikely that it ended up with a 1959 (or 60) frame.
I'll pour another drink and ponder this a little more.