[Maciej Góralczyk]

Not so few actually - amongst 41 Emils sent to Spain, there are only 7 confirmed E-1s (6•118, 6•119, 6•120, 6•121, 6•122, 6•123 and 6•124) and 5 aircraft that I'm unsure about the exact variant (6•103, 6•113, 6•114, 6•129 and 6•131). As for the serial numbers, I'm only aware of one: WNr. 715 of Bf 109 E-3 coded 6•92. 6•99 is also from the 7xx range, but the exact number is impossible to read from the the photo.