Well, it took some time to assemble my two posts and when I was done two others had appeared. I thank PostmasterGS for the text and drawing links. You were close to the mark but I coordinates are based upon an 1908 USGS Topographic map with the building placed. I was consistent with the hand-drawn official location map. You get the credit for triggering the other side of the item being shown. As No1philatelist guessed the other side is shockingly nice eye candy. But complicated and does not obviously rate out. Now to explain:
Insured Parcel Post in Canada (domestic) did not start until 1921. From the point of view of a US collector, Canada was the first country with which the USA exchanged Insured Parcel Post beginning 1-1-1923. It was also the first foreign country to which parcel post could be set Insured. So the "Insurance Tag only went along for the ride as a way to attach the postage stamps. In 1914 insurance had two levels, $25/$50; 5/10 cents.
Parcel Post to Canada was limited to just 4 pounds, 8 ounces which needed to be rounded up to five pounds. PP Postage to Canada was 12 Cents per pound or fractions (US Domestic Zone 8 rates). So, 5 x .12 = 60 Cents. The other $1.06 can be explained even with 10 cents for registration (only indemnity offered for foreign parcel post from USA).
Oh, oh, I know, $1.66 would pay for 83 ounces of (first class) letter rate matter at 2 cents per ounce; 78 ounces if a dime was used for registration. BUT, the (first class) letter weight limit was only 4 pounds 8 ounces, 72 ounces max.
Now in the USA in some larger cities multiple packages charged individually went in to the same postal bag for delivery to the same recipient with total postage affixed to the bag. In some cases one registration fee was paid or insurance was paid and by postal rule treated as registered due to the special specific contents such as dead money or coin.
Now I doubt this was how this tag was used even if 13 pounds (some combination of parcel rounded up to the next full pound, but not over 4.5 actual pounds totaling 13 pounds) plus one registration charge (a dime). That is 13 x .12= $1.56 + .10 makes $1.66.
All that said, sometimes all you need, or can do is drop the item on the table or mount it in a frame so everyone can just look and say, "wow."
{Note to John Becker: After I read your post I did a two handed facepalm. I flat forgot all the 1913-1918 Atlases I own which included Parcel Post Rate information. Now where did I put them in my stamp office clean up and reorganization?????

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