Early-war MG34/42 Patronengurt 34 belt 'B 10.39'

A scarce example of an early-war Patronengurt 34 50 round belt, as used with the MG34 and later MG42.
 
This particular example is presented in good original (uncleaned) blued condition and is very clearly marked with the 'B' maker's logo and date stamped '10.39' to indicate production during October 1939.