SIG markings?

[Steelharp]

Guys, what do the markings on my SIG P226 slide bottom just in front of the dustcover mean? It looks like a kind of insect shape, then a candleabra type shape with downswept lines to the sides, a very tiny N under that, then KE. It is a West German gun, U 501 5**.

Thanks in advance...

 

[Mtdew]

the bug and crown are factory proofs...

the KE means it was made in 94

 

[Sodbuster]

Sig date code: A=0 B=1 C=2 D=3 E=4 F=5 G=6 H=7 J=8 K=9

 

[Steelharp]

Guys, thanks. I really appreciate it.