I like the Great Britain stamp in the upper right corner (Queen Victoria, nice numeral cancel), and the Australian King George 5th side-faced stamps (4).
Some of those would be worthwhile looking for watermarks to see in they might be inverted (upside-down), but then again that would not knock it up into the $1000 range, just the $20 range perhaps. The GB KGV Silver Jubilee stamps also.
I am not sure about the Cochin 9 pies stamps (Indian State).
Sometimes with these slightly older stamps the collector who specializes in them will know the little things to look out for. Perhaps read through Tony's topic/thread on the Indian States here.
And KGV_Collector's thread on the Australian stamps, I am just beginning at them.
Not sure on some of the others.
It would be interesting to see what they would go for on
ebay. Start it at 99 cents and see where it goes. If you ever decide to sell, please let us know. Try to put the stamps on a plain dark background and all of them right-ways up to aid in selling.
You do need 50 posts to buy/trade/sell on here, but you have a dedicated, trustworthy audience here.