images for reference

I purchased yesterday a 5 Yuan note dated October 1, 1914 and I have some questions about some of the images on the note:

• 1. At the top of the bill, it says Bank of Communications. This seems like a strange title for a bank. Why is it called that?
• 2. It’s a little hard to see, but on the building in the image, it says Chinese Government Post Office. Why would this be the building they featured on the bank note?
• 3. It looks like Shanghai is stamped on the note at the bottom. Why would this be printed on it? Would the note be circulated only in Shanghai? I have done some Googling and it looks like the notes stamped Shanghai were all printed with the date October 10, 1914. Is there a reason for this? Also at the bottom, it says American Bank Note Co., New York. I have looked this up too and it looks like they printed currency for a lot of countries. Was there a reason they did this?
• 4. Why is the currency printed in English and Chinese? Is this something that would be used in the international settlements?

Thanks in advance for your responses! I have an interest in Chinese history and I hope my questions can be answered.