Actually there was no such thing as a "Bf 109 E-7/b" since the stock E-7 incorporated the ETC attachment of the E-1/b, E-3/b and E-4/b into the production process (and added the necessary plumbing for a droptank). The /b suffix simply denoted a modification for the earlier Emils that enabled them to carry an ETC and a bombload.
As for the Friedrich Stab/JG 51 received a number in October 1940 (Bf 109 F-1 with MG FF/M as central cannon) for frontline tests. Werner Mölders claimed a kill on October 25 as the first kill ever to be claimed by a Bf 109 F.
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