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Message: <blockquote data-quote="jring" data-source="post: 3832446" data-attributes="member: 133897">Hi,I agree with Henry on the Delactem - only 8x40 center focus model in the general vicinity of the date of mfg, but it is interesting.The serial number dates this in 1930 and the Delactem is listed as having been produced from 1931 to 1943 - so either the list of serial numbers is off by a few ten thousand (not too likely) or we have a very early example of the Delactem.<a href="http://www.europa.com/~telscope/zeissbin.txt" target="_blank">http://www.europa.com/~telscope/zeissbin.txt</a><a href="http://home.europa.com/~telscope/zeissbn2.txt" target="_blank">http://home.europa.com/~telscope/zeissbn2.txt</a>As for using it - modern bins with modern coatings will be a lot better than this obviously uncoated example. If you are a collector, things are different of course. Although a 8.75 deg true field of view is quite nice in an 8x40 model... how sharp is it at the edge?Joachim</blockquote>