A Very Hard To Find ''very Common'' Chinese Stamp

We all know how frustrating it can be not being able to find that one missing stamp in a set, even when that stamp is supposed to be ''very common''. Collectors of Chinese stamps must surely know the feeling... I present you a fine example: the 200 dollar-stamp of the Sun Yat Sen-set Litho Dah Tung-print (1949, Stanley Gibbons 1165). It looks a lot like the 200 dollar-stamp of the Sun Yat Sen-issue before that, Stanley Gibbons 1157. The 1165-stamp has much more details in the face of the president. These stamps were printed in the final days of the Republic, when inflation was rampant. The litho-issue was to replace the issue before that because stamps could be printed quicker that way.
All these stamps are very common, at least the unused ones. Used are somewhat higher priced, but should be more expensive, because they are much scarcer than mint ones. The 200 dollar litho is the highest priced unused, a dollar or the like, and clearly the least common one. Least common? Very rare! It took me many years to find it. It popped up in a messy collection I bought, that proofed to be a treasure trove filled with a lot of those elusive used, ''common'' stamps that are very hard to find. Now I still have to find another collection that contains this 200 dollar stamp used...

Not a small accomplishment but with great satisfaction. Used can be equally challenging if not more so. Thanks for posting.