I have two questions about the old style of Chinese letter-writing:
1. What does the opening phrase "大鑒" mean? Is it the same as "台鑒" (which I understand to be the more common opening phrase)?
2. What does the closing phrase "叩上" mean?
PS. I got these off a letter written by a distant uncle to my grandparents about 55 years ago.
Regards,
Mark Yong