Selling this 138mm Tiffen Rota Polarizer that is threaded and comes with a retaining ring that is normally sold separately. Used listed price for the pola and ring is $179. This filter does not have a single scratch on it. Hopefully you can tell by the photos. Happy to make a video under the light and send it along. 

 
Selling off historical filming equipment used here at Tyler Camera Systems (Tyler Mount). We have several items that have been sitting in our vault untouched and in great condition for about the past twenty years. Feel free to look at all our posts. Everything in house has been kept in amazing condition, we will state it otherwise in any listing. Sad to let this stuff go as it's been a part of our history and journey shooting aerial images. 

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https://www.ebay.com/sch/i.html?item=145700553702&rt=nc&_trksid=p4429486.m3561.l161211&_ssn=elizabetziegle8