More Help Needed In Identifying Some Chinese Stamps

OK I have five stamps that I am unable to locate. I have gone through my resources and I am either overlooking or misidentifying these stamps.
Stamp #1 is very heavily cancelled, I know it is an Imperial Dragon.
Stamp #2 is also heavily cancelled but I think an overprint is concealed in it.
Stamp #3 is an Imperial Post but I am unable to identify the overprint.
Stanps #4 & #5 are Sun Yat-sen but I can't find the amounts to correspond with a set.
I thank you in advance for your assistance. The good news is that after these stamps, I am done with the China section till more acquisitions are made.

From left to right:

Row 1
stamp 1: #98(1898) if watermarked, #111(1900) if unwatermarked

stamp 2: (Shansi) #5N20(1941) -- confirm it is perf 14, else 5N12(1941) if perf 12½

stamp 3: #166(1912), there are 3 basic type of "Republic of China" overprints & yours is the one made by Waterlow & Sons; even though you can only see the last character clearly, the font used is by W&S


Row 2
stamp 1: #632(1946)
stamp 2: #631(1946)

khj and the others of this forum. Thank you for your patience and for the valued assistance. I appreciate all help that is lent me in the pursuit of this hobby. Everyday I learn something new about the world though my philatelic collection.

You're welcome. I haven't touched my Chinese overprints in about 20 years. So it's always nice to be able to practice on a handful so I don't get rusty.

Enjoy your stamps!