 Medium tenon neck joints with dowel reinforcements were used up until 1981 and standard Gibson style long and medium tenon neck joints were used after 1981.The medium tenon neck joints with dowel reinforcements were very similar to the Gibson long tenon neck joints that were used in the early 1970s before Gibson switched to using a short tenon neck joint.Some Greco models featured chambered (not solid) body designs up to the early 1980s, which weighed less than a regular solid body model and also had a slight semi acoustic quality.