The Hong Kong 'China' Overprints - British Post Offices in China from 1917 - 1930

I am trying to find copies of the following items. If you have, or know of anyone who might have the following for sale, please let me know!

Thank you!

Stamps

• S.G. 1 1c Brown Watermark Inverted Unused or Used
• S.G. 6 10c Ultramarine Watermark Inverted and Reversed Unused or Used
• S.G. 26 50c Bistre on Emerald with White back
• Specimen overprints on the Script 2c and 4c Unused
• Requisition Letter blocks, singles or multiples. Unused or Used (See Requisition Letters)
• Overprint varieties Thinned left leg of H on Second Issue 2c, 4c, 25c, 50c
• Missing Right leg of A on Second Issue 2c, 4c, 50c
• Slanted China on the Second Issue 4c

Postal Stationary

• Postal Cards P41, P43, P45 or P45 Used or Newswrapper Used
• Postal Cards P44 Unused and used (the overprint on the P43, however, not the common P41 overprint) - see below)
• Any of the postal cards overprinted Specimen

Registered Envelopes

• Any of the Envelopes overprinted Specimen
• G C2 Used and Unused
• G C3 Used
• H C1 Unused
• H C2 Used and Unused
• H C3 Used
• K C1 Unused
• K C2 Used and Unused

Covers

• 1 cent local postcard rate
• 1 1/2 cent local postcard rate
• 3 cent local postcard rate
  

Earliest or Latest known, single frankings or unusual usages from any of the ports.

Cancellations on cover

Amoy Jiv Index F, Ki Index B and Index F, Kii, Riv no letter, Riv Black

I am always looking to buy any stamps, covers, stationary, blocks or anything relating to the 'China' Overprints.

In addition, if you, or anyone you know, has registered envelopes, I would appreciate receiving information, particularly copies or scans to add to my census of these items.