I am new to this site and certainly no expert and not with your experience. I was not sure where to or what the "thecead.com" was. However, in my search around the site, I came across your post on November 30,2016…"
"I would say secretarial. The signature looks too neat and the letter content suggests that the work of a secretary. Very often secretaries were asked to write things like "thank you for your kind gift/words" and "I'm very much…"