Original 1943 Jaeger-LeCoultre Mark 7 A, issued to the Royal Air Force during WWII under military designation 6B/159. Caseback engraved 6B/159 A 25201 — no /56 suffix, confirming this is an un-re-cased original example, not a 1956 Ministry of Defence rework. The majority of surviving 6B/159s were re-cased by the MoD in 1956; finding one with its original chrome case intact is uncommon.
~30mm case. Manual wind. Plexiglass crystal. Comes on a NATO strap. Movement is running but service history is unknown.