Besides BCS (who do not partake in such murky/debatable practices) - other TPG will occasionally commit themselves to grading an error (as an "error") but most do not. This is especially true with missing OSD or holographic errors b/c they're notoriously disreputable (ie faked).
I was referring to the fact that a BCS certified (as an "error") polymer without hologram was listed on e-bay and sold for significantly above face value.
Holographic errors (& OSD - Optical Security Devices that are missing) are considered extremely dubious in terms of validating their authenticity. Check out P. 409 "note" on bottom of page in Charlton 27th Ed Canadian Government Paper Money Catalogue which states "Errors with the OSD missing are no longer listed here. These errors can easily be faked. It has been discovered that a common cleaning product can remove the oSD without a trace...."
In the prior edition of Charlton that I have it also lists error BC-58b - Missing Holographic Strip. The quote from them:
"Holographic strips can also be removed from the notes. In this case, the overlying printing will also be removed. A genuine missing holographic strip error note will show the coat of arms and denomination, normally superimposed on the strip, printed directly on paper"
Firstly it has been shown that there are chemicals that will remove the hologram material without removing the intaglio ink. So the criteria of a genuine missing holographic strip error in the GPM catalog can be reproduced in a note with some common chemicals. As I said in a previous post a bit more time consuming then the polymer but easily possible nonetheless. The accompanying image I believe begins to prove this point.
Secondly the example in the GPM Catalog shown as BC-58b with a $20 note. The note is supposed to show a genuine missing holographic strip.
I am no expert in these things and still have a lot to learn but with all the notes I have seen I think the word "Canada" running along side of the hologram is part of the hologram.
So in the genuine missing holographic strip error would one not expect the word "Canada" to also be missing?
Maybe the GPM has already ruled this type of error to be not genuine just like missing OSD. I will have to check the latest catalog to figure it out.