Canada color question

I've posted a graphic here of two stamps identified as Canada Scott 37.

http://yfrog.com/15canadascott37j

Scott lists the basic catalog number as orange red with a value of
$1.25. There are three varieties -- 37a is rose valued at $10, 37b is
copper red valued at $50, 37c is dull red valued at $2.50.

I believe the stamp on the right is the basic number, i.e. orange red.
The question is whether the stamp on the left is 37b or not. The
condition of the stamp is not that great, so it's probably nowhere near
the $50 catalog value even if it is 37b. These stamps were issued in the
1870's. I found them in a collection from the father-in-law of a quilter
friend of my wife.

Opinions?

Thanks

Bill Sharpe