Yes - a museum apparently. The postage is pre-decimal 10 1/2 p - which may give you an idea of the time period, assuming this was first class postage paid. Also check catalogue - may be an FDC.
The stamp is from the DOGS issue of 1979 (s.G.1076). The slogan postmark reads "National Postal Museum/ opened by/ HM the Queen/ 19 February/ 1969". So it is a decimal stamp with a slogan commemorating an event in pre-decimal times
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