I have a never used HAL XTK-1 xtal osc board for the ST-6. Still in it's original package but it has been opened. I never used this even though i bought it many years back. Looks brand new. Don't have a clue as to what i paid for it back in the 70's when i got my first ST-6. Any help or desires to have this? Shipping extra but minimal. Larry W0OGH