On looking through the pages of the excellent "Messerschmitt Me262 - The Production Log" it appears that whoever put together the colour profile and caption has confused the two Me262's which were allocated AM51:
WNr.110800 - Me262A-1a coded "White 7" was indeed allocated AM51 but suffered a nose-gear failure with W/Cmdr Schrader at the controls. There is uncertainty as to whether this Me262 was repaired and flown at the RAE or that it was scrapped at Lubeck-Blankensee. A b/w image of "White 7" is included and features a standard JG7 emblem, like that pictured on the Mushroom profile.
WNR.112372 - Me262A-1a (possibly "Yellow 7"?) was also allocated AM51. It survives today and is displayed at the "Milestones of Flight" at the RAF Museum, Hendon. There is a b/w image of this aircraft at Schleswig and a "Red 2" can clearly be seen on the JG7 emblem.
There has also been much confusion on the surviving aircraft now at Hendon as it was displayed at the Aerospace Museum at Cosford as "Red X"... some further explanation can be found here:
http://www.luftwaffe-experten.org/fo...pic=17&hl=AM51
Kind regards,
Peter D Evans
LEMB moderator