Welcome to Numista!
I am not knowledgeable enough to comment on authenticity (hopefully others will), but can identify the first two coins
For the first one
https://www.omnicoin.com/coin/1027495
1896 China's Ching Dynasty Silver Dollar Coin minted by Pei Yang Arsenal in Ta Tsing 22nd Year of Kwang Hsu. Obverse: value in Chinese characters “壹圆” (one yuan) in central circle, encircled with “大清光绪二十二年北洋机器局造” and some Manchu script. ( meaning Pei Yang Arsenal in Twenty-second Year of Kuang Hsu); Reverse: dragon seated with English TWENTY SECOND YEAR OF KUANG HSU; PEI YANG ARSENAL.1896年大清光绪二十二年北洋机器局造壹圆银币
For the second coin
https://en.numista.com/catalogue/index.php?mode=avance&p=1&l=&r=&e=chine_empire&d=&ru=&i=&ca=9&no=260&m=1&v=&t=&a=&w=&dg=&f=&u=&g=&c=&tb=y&tc=y&tn=y&tp=y&tt=y&te=y&cat=y
China empire, Yunnan province, Dollar, .900 silver, ND (1908-1911), Y#260, weight 26.8 g
Was unable to locate the third (ROC) coin.
I hope this at least makes a start and gives some help.