I Have a ’70 lyle hummingbird and its a solid spruce top and mohagony neck back and sides. My guitar luthier fully inspected it. Mine is in near mint condition and sounds identical to the ’64 Gibson Hummingbird my luthier has. He was trully freaked out by this.. ha ha He keeps trying to buy it from me but im affraid im hanging on to mine. It seems there is alot of contradictory information on these guitars. It is super hard to get more than a small paragraph of info on these things. One site out there has several catalogs from lyle guitars but they require a payment or paid membership to view them. If you are interested google lyle guitar catalogs. There is one that sold for 600.00 at joes vintage guitars.com Its Identical to mine. If I find any more info Ill post as discovered.