Need Help With 1950-S Chinese Stamps

Hi,

A stamp collection has been passed down to me and I've found a page of interesting Chinese stamps (I've also listed them on ebay but not sure if its OK to post auction links here.), but I'd like to know a bit more about them - I know some of them are Tian An Men designs but I'm not a collector myself and it would be nice to know a bit more about them... so I'm wondering if anyone could tell me anything more - and whether there's anything else interesting in there?

Thanks for taking a look..

The first stamp is Japanese ,the rest look common and those stamps with the girl excerising are most likely reprints .

the blue "postman " is Japanese also ,you also have the third stamp is a Manchukuo stamp.

Thanks for the extra info - shame there isn't anything else very interesting or unusual in there but I have to admit I didn't spot the two Japanese ones - Thanks.