Zenith Vintage Chronograph

Beautiful Zenith vintage chronograph, manual wind caliber 136, circa 1950. 18k yellow gold (750) with a warm pinkish-hue, and very unusual applied Arabic numerals.  Case diameter is about 37.5mm without crown, and lugs are 20mm and buckle (NOT original to watch) is 16mm.  I am a novice collector - not an expert watchmaker- but the watch is in good working condition (strong tick!), and excellent cosmetic condition other than a faint scratch on the plexiglass crystal between the 1 and 2 hour markers (visible in the second photo).  I acquired the watch from a watch dealer in Germany within the past year, and am selling it simply to finance another acquisition.  He informed me that the watch had been serviced prior to sale, and that it is entirely original, though I can't independently confirm that (certificate from watch shop is included).  If the dial has been refinished, it's a really lovely job.  The strap is brown ostrich.  The watch is being offered "as is," with no returns, so please inspect the photos carefully and feel free to ask any questions.  Price is firm, cash wire only (no PayPal or checks) and watch will only be shipped with signature confirmation of delivery, so no PO Boxes.  Strong preference to sell to a US address, but will consider Int'l shipping with references and shipping label provided by buyer at their cost.  Thanks for looking.