What is the value of a pair if wb mfg co silver vases tapestry?

Tapestry vases come in four models:

3538 8 1/2" 2009 $40

3539 12" sold 2010 $50

3540 14" sold 2009 $60

3563 abt 16" sold dec 2010 for $180.

I have never seen a pair for sale although I have pairs bot as individual pieces, I would add 10-30% for a pair.

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Mark Todd