Buckingham first day cover with 5 ‘Dr WHO’ commemorative stamps issued 26th March 2013. They celebrate Classic TV-50 Years of Doctor Who.
The stamps are:-
1st William Hartnell
1stcPatrick Troughton
1st Jon Pertwee
1st Tom Baker 
1st Peter Davison

Postmarked:- 50 Years of Dr Who, Cardiff, 26th March 2013.
Pictorial Tardis in the centre.

The cover has the genuine hand signed signature of Peter Davison.
There is a small label on the reverse which certifies:- Peter Davison popular British actor and the Fifth Doctor Who, has personally signed no more than 400 Buckingham Doctor Who covers with 5 stamps showing the first five Doctors pmk’d 26/3/13.

This cover is number 174 of 400.

The cover illustration is from the BBC.
Peter Davison (born 1951) is an English actor with many credits in television, dramas and sitcoms. He made his television acting debut in 1975 and became famous in 1978, as Tristan Farnon in the BBC’s television adaptation of James Herriot‘s ‘All Creatures Great and Small’  stories. His subsequent roles included the sitcoms ’Holdind the Fort’ (1980-1982) and ‘Sink or Swim’ (1980-1982), the fifth incarnation of the Doctor in ‘Doctor Who’ (1981-1984), Dr Stephen Daker in ‘A Very Peculiar Practice’ (1986-1988)  and Albert Campion in ‘Campion’ (19 89–19 90). He also played David Braithwaite in ‘At Home With the Braithwaites)  (2000-2003), “Dangerous” Davies in ‘The Last Detective’ (2003-2007) and Henry Sharpe in Law & Order: UK (2011–2014). 

Information sheet about him enclosed.

The reverse of the cover is entitled ‘Fifty Years of Doctor Who’ and gives a few details about the first 11 Doctors, from William Hartnell to Matt Smith.
Sorry listings are for one month only.