Carl Zeiss Jena Planar 20mm f4.5 macro objective lens for microscope use Germany

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This is a pre-war Carl Zeiss Jena PLANAR 20mm f 4.5 microscope objective lens with iris ring, Made in Germany, as shown in the photos. It has the original black metal coating (vintage circa 1909). Marked "D.R.P. 92313" in the front and "Serie Ia Nr. 1" in the back. This is a photomacrographic lens (Lupenobjektiv) that gives excellent two-dimensional depiction of flat surfaces, usually used without an ocular. RMS standard screw mount. Similar concept to Zeiss Mikrotar and Luminar, Leitz Milar and Summar, or Reichert Neupolar. THE FINE PRINT: Trimming down my collection due to a shift ofinterests. For cosmetics, please see photos ofactual item. Please, no returns or refunds or after sales "pressures". Please do not ask for after-sales refunds. Methods of payment: PayPal only. Item weighs 20 g unpacked. Shipping Express Registered within the EU or Airmail Registered rest of the world with tracking number, at cost (no charge for packaging or handling). Thanks for looking. I WILL NOT SELL TO ANYONE WITH 0 FEEDBACK RECORD. MINIMUM FEEDBACK SCORE REQUIRED 20, AND 100% POSITIVE, ABSOLUTELY, NO EXCEPTIONS. IF YOU H AVE LESS THAN THAT, PLEASE D O NOT BID, I WILL CANCEL THE TRANSACTION, DUE TO TOO MUCH HASSLE IN T HE PAST. ONLY PAYPAL PLEASE. I WILL ONLY SHIP TO CONFIRMED ADDRESS. PLEASE COMPLY WITH THESE REQUIREMENTS. THANK YOU FOR UNDERSTANDING.