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I can only say that even stamps issued after 1960 do command a premium compared to the same stamps being sold that are hinged.
It is one way of putting it. I look at it as Cjd appears to do. For Great Britain, Spain, and the Netherlands, catalogue prices are for unmounted mint and used only from 1940 onwards. Unused hinged stamps are steeply discounted from unmounted mint.
Pre-1940 listings used to be for unused hinged and used only. Increasingly - and quite contrary to what Floortrader claims - these catalogues add columns for unmounted mint stamps for all 20th century listings. The Stanley Gibbons Concise - for quite some time - includes unmounted mint prices from the 1887 'Jubilee' stamps onwards.
The mark-up for classic unmounted mint stamps is increasing. They, however, are getting very rare.