Messerschmitt ME109, BF109 Access panel
Here we have an access from an ME109 which was obtained from an aircraft restoration company based at IWM Duxford.
Judging from the condition of it it is clear that it has been removed from an airframe rather than been a crash recovered item. Unfortunately there is no history or aircraft ID to go with it. I would suggest that this is then rear fuselage access panel as shown in the drawing
The panel measures just over 16 inches wide by 13 inches high. A nice man cave item.