@gloriouscow From a quick glance + calculation I get 3.2 MHz for the 130 uH coil. The capacitors should be the same on XTAL 1 +2; I'd change the coil to get the desired frequency. If you can check what values were assembled in.

@gloriouscow If I plug the numbers in from above formula I get 3.2 and 5.6 MHz, respectively

@gloriouscow 5.10 Mhz