1948-49 China Watermark

As I am sorting through and mounting various envelopes of unidentified China stamps, I ran across these 2. They appear to be Scott 828 and 832. However, these are listed in Scott with no indication of Wmk. or Unwmk. So to follow the usual Scott practice of using what the last indication was, I assume these should be Unwmk.

However, as per the photos, they are clearly watermarked with vertical wavy lines. Again there is no such watermark listed in Scott for this time period of China, or are they a later printing on Wmk. 281 paper? Maybe someone can tell me what I have here.

looks like residue of strokes of gum when applied.

Interesting response. The originals were all issued with no gum. These stamps were ungummed and washed in warm water to remove hinge remnants. So since they are unused, where is the gum coming from?

I have now found several others from this surcharge issue that show the same wavy lines. I am starting to wonder if this is ribbed paper instead of a watermark. Hopefully someone with a more specialized China catalogue can shed some light on this.

Source: Ma's Illustrated Catalogue of the Stamps of China (1998 edition).

Scott A63. Issued 1944-46. Chungking Chung Hwa print. 20-cent scarlet. Typographed. Perforation 12.5 line type. Unwatermarked. Printed on native paper without gum. (Per Ma, 15.5 version has high catalogue value.) (Ma, page 189)

Scott A62. Issued 1942-43. Central Trust Print. 25-cent purple. Typographed. Perforation 13. Unwatermarked. Printed on native paper with line marks. Without gum.

Per Ma, five readily distinguishable paper types. (Pages 143-46.)

Thank you Calstamp. Since I do not have a Ma catalogue, I do not have a listing of what the 5 paper types are on pages 143-46. However, the comment "Printed on native paper with line marks" seems to answer my question and suggests that it is what we would call ribbed paper as I started to suspect.

PMStamp.

Appreciate your acknowledgement.

Plz note that your SCF profile prohibits sending you email. And as the Ma Catalogue is a copyrighted work, am not willing to post four pages of content. Personal transmittal for educational purposes is another matter.

Thank you for pointing out the e-mail issue. I was not aware of that apparent default setting and have now changed it.