Canada Booklet Bk280Abii Cover Printed On Gum Side

I recently won this booklet at a mail auction and it arrived yesterday. However, when I compare this booklet to a standard BK280Ab I can see no difference.

What am I missing or how can you tell the difference? Did I pay a high price for a $5 booklet?

I actually looked for any indication that the previous owner had lifted a stamp corner to test for gum, but couldn't find any mark so I guess I will try. I was hoping there was another way such as measuring thickness or something less potentially destructive.

Do not lift the stamp unless absolutly necessary! There are other non destructive methods to determine the difference. For 1)one, you can usually put the booklet alongside a regular one and angle them to the light. Canadian Booklet covers of self adhesive gummed stamps usually have more sheen on the backing cover paper than the actual gummed stamp paper which has less sheen. This is how I discovered a couple copies of BK699i. If the stamp is printed on the ungummed backing paper you will see the difference. 2) Two, use a longwave UV light to detect paper and flourescence difference. It will be obivious. And you will also see if it was properly tagged or not. Attached is a link about that booklet
https://goscf.com/t/62012

Edit: added word "Canadian", and attached link to the story with image of booklet stamps printed on ungummed backing paper.

Gently lifting the corner of a stamp hardly seems "destructive".

I have yet to see how you "gently" lift the corner of one stamp without leaving a mark. Bending the cover slightly to see if a corner pops up would be the best, but hardly ever works. Using tweezers, fingernail, or any other sharp object to lift a corner will leave a mark. So I will try the UV light suggestion to see if I can see a difference.

I must not be understanding this. If it is an error booklet with the associated value premium it will not have gum on the back of the stamps? If that is correct than why is it so difficult to lift the corner of a stamp? If the booklet is normal than you have just lifted the corner of a stamp that is worth face value or less? I know I must be missing something here.

Stamps of large value are lifted from covers all of the time to inspect grills etc.

No need to lift a corner of a stamp.

Lamp the booklet (i.e. look at the front and back of the booklet under an ultraviolet light).

For this 49c Flag over Edmonton booklet, a 'normal' booklet will be dull on the stamp design side and hi-brite on the back of the booklet.

An error booklet (i.e. where the paper was inserted into the printing process upside down; and thus, a stamp, when removed, has no gum) will be hi-brite on the stamp design side and dull on the back of the booklet.

Thank you studystamps. This is the info I was looking for without having to damage the booklet.