Just for historical interest, here's a link to a "Chesterfield" headstock X-79 on Reverb with S/N #108. So, we know now that at least 108 were made with these necks before they switched to the all mahogany necks with the headstock with a shape similar to the body.
reverb.com
I believe Skylark on this forum has #99 and I have a black #82 with the Chesterfield headstocks. I believe at first that they were putting these Starfire type necks on before they switched to the more familiar necks that the majority of the model have.
Guild X-79 1981 - Candy Apple Red | Reverb
Legendary Lynyrd Skynyrd guitarist Allen Collins said of the Guild X-79, "As soon as I saw this guitar, I knew it was made for me." I dig this guitar immensely, it just doesn't get the attention it deserves next to my other electrics. Often referred to as appealing to hair metal players.... not...
reverb.com
I believe Skylark on this forum has #99 and I have a black #82 with the Chesterfield headstocks. I believe at first that they were putting these Starfire type necks on before they switched to the more familiar necks that the majority of the model have.