(Thanks to a long-time friend who contributed to this story.
I think we should all working together to stop these people from destroy
imperial China philatelic interest ¨C Tom)
I had enough of the fake covers on ebay. One of the active sellers
has ebay id ¡°cashstamp888¡±. This person has been selling modified Red Revenue
and Covers. He is a stamp dealer in Ho Mon Kok Shopping Center. Room 207,
Kowloon Monkok. His mobile number is +852 602 85839. His name
is Ka Wai Luk. Here is his most recent creation.

The cover:
The recently surfaced covers are almost
all using a genuine cover, that originally with a cheap issue, like a coil
dragon stamp. Then a red revenue and/or dowager stamp(s) were added to replace
the coiling dragon stamp, and a forged cancellation was applied on the added
stamps.
Almost all these forged covers have
multiple franking, and mostly including a red revenue stamp to enhance the
value. The multiple franking might also be needed to cover up the original
cancellations after the coiling dragon stamp was removed.
The stamps:
The picture above is one such example,
and sold in eBay recently for $4450. A close examine indicates the Dowager
stamps are heavily toned, while the red revenue stamp and the cover are well
kept, without any sign of toned color. This indicates the dowager stamps were
probably united with the cover and the red revenue stamps recently, rather than
when it was mailed in 1898.
Furthermore, the red revenue stamps and
Dowager overprint issues are largely replaced by coil dragon stamps in 1898,
and the 10c stamps are readily available. Such multiple franking are usually
added by a stamp collector rather than a post office clerk. Such philatelic
usage by stamp collectors are well documented over the years, because these
covers would eventually being sold, traded, or exhibited during in the first
half of the nineteen century, such as the Macus covers.
A newly discovery of one such
philatelic cover after 100 years is usually, not to mention the Taku dollar
dater was not recorded on a red revenue stamp, let alone a cover.
The cancellations:
A research on the known genuine Taku
dollar dater indicates all usage before and after August 1898 was in very dark
blue color, and never recorded in such light blue color.
In addition, unlike large and busy post
office like Shanghai, which use more than one chop, Taku is a small post office
and presumably only one chop was used during this short usage between August
1898 and July 1899. Although the Taku cancel on the cover match well with other
known genuine usage, the star at the left did not match the pattern from
genuine usage (see below).

Finally, for a 1898 combination cover
to Germany, the lack of any transit mark in top picture, except the Shanghai
dollar dater is also very
suspicious.
More thoughts:
When serious about investment on the
red revenue and/or dowager covers, I would buy from reputed firms that have extensive
knowledge and expertise.
Use of an expertization service,
including the service offered by China Stamp Society. It cost little compare to
the value of the cover. And it not only protect your investment on these covers,
but also will enhance the value of your cover over time.
Invest a few hundred dollars on
reference books. It not only increases your knowledge, but also with a lot of
fun.
Use common sense. When a $5000 Rolex
was sold for $500, the chances are, the Rolex is probably no good. Same for
these Red revenue/Dowager covers. Even for the above ¡°Taku¡± red revenue cover.
Although it was sold for $4450, a genuine cover, if exist, would probably fetch
$30000 to $40000 in Hong Kong, as Taku dollar dater are yet to be found on a
red revenue stamp, let alone a cover.
There are estimated only about 200 to
300 red revenue covers exist, and much of it are single usage from known
correspondence. A good portion of it were already recorded in the red revenue
book, and mostly are in well known collections. There are probably less than 20
genuine pre 1900 red revenue and dowager mix frank cover exist. The odds for
such a genuine cover offered in eBay at $1, and with different ones offered
every month, is probably just too good to be true.