Hello! by s/n it should state as Bf 109K-4 but erla production.
by the way we all know that Erla production G-10 (Bastardflugzeug Erla) had steamlined port cowling.
On
http://bf-109.de I have found the foto of K-4 W.Nr 570276 and we see steamlined port cowling with rectangular panel.
http://bf-109.com/display.php?lang=e...otonummer=4814
Does it mean that situation was the same for all Erla production K-4?