[Milsurplus] What is this optic item on Craigslist

[jmfranke]

I believe it may be a drift sight to determine wind drift for navigation.

John  WA4WDL

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From: "R PRECHTL  K7DFW" <k7dfw at clatskanie.com>
Sent: Saturday, May 04, 2013 11:39 AM
To: <milsurplus at mailman.qth.net>
Subject: [Milsurplus] What is this optic item on Craigslist

> 
> Claimed to be for aircraft use.
> 
> What is this?
> 
> 
> http://portland.craigslist.org/mlt/atq/3763216348.html
> 
> 
> 
> 
> RP
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