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Martin BM-1

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Jul 5, 2008
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I am seeking some help identifying a period, original photograph of a BM-1.    
I had hoped to ID the specific airframe bureau#, but that is probably fruitless.
Does anyone know what that protrusion is on top of the wing?
Also, the location?   Is that a recognizable NAS in California?   Moffett?
Lastly, the back of the photo has an odd note that says " Martin BM-1, N2 OLB".    Any idea what that is?
Thanks for any help ... I very much appreciate it!
--> Chris Baird

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