(a)
My today findings.

Eagle is in much better condition than as depicted in the photo and has approximately 95% of the original finsih. Unmarked with both prongs.

Can anyone tell me what the "NA' on the SS Mantel tag signifies?

(b)

(c)

(d)

just guessing here but
"Nachrichten Abteilung"
(Signals Battalion)
??

neat tag!

That is an overhoff eagle John, should be marked on the upper left wing under the prong in your photo.