Russell, I have some John Calderwoods in my ancestry, but they may be farther back than yours. I'll try to check on that. In the mean time, feel free to email me at firstname.lastname@example.org
I tried reading what yours is but wasn't sure on a letter or two. Anyway, good luck in your search. Hope to hear from you soon.
FaeLynne "Calderwood" Gertz