You've got a really nice mix of Asian coins there! It is hard to tell from the darkness of the pics, but it looks like you have a collection of late Qing dynasty copper coins. You've got some early Republic of China coins (I see ones from 1914, 1916, and 1924). In addition to the Thai bhat coins, you've also got some older Japanese coins as well.
As for the large silver Republic of China coin featuring Sun Zhongshan (Sun Yat-sen), the date is 1933. The obverse reads "Zhonghua Minguo Er Shi Er Nian" (trans: Republic of China, Year 22). Since the Republic was founded in 1911, you just add 22.
All of the Republic of China coins I see in your pics were legal tender, IMHO, and not commemorative.
Hope that helps.