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What is the value of SG45?
A mint stamp that has been previoiusly hinged: £50-£110A used stamp: £1.50 -£4
What factors detemine the upper and lower range of the stamp value?
The main factors for the mint stamp is centering. For the used stamp a light postmark is preferred with centering also a consideration.
Top Image: Kensington 1856
GB STAMP GUIDE