They are being listed by Scott Catalog as follow:
#1170: $10.00 face value: $20.00 (mint), $20.00 (used).
#1171: $90.00 face value: $180.00 (mint), $180.00 (used).
Stamp collecting (philately) is dying. You go to a stamp show and you do not see any children. Only very old people.
Greed is everywhere.
It will be interesting to see the value that Stanley Gibbons publish in their catalog for those two stamps.