These binoculars appear to be very early in the production because of the serial numbers being under 500,000.  They are in outstanding condition showing very little wear and clear lenses.  These binoculars were made in Germany from 1910 - 1927/28.  the left eyepiece has it's own focusing mechanism from center o to +.  Inscriptions on the left prism cover feature Carl  Zeiss over Jenna while on the right prism cover is Teletur 448826 over 6x.  Additional pictures or information is available if needed.  Be sure to note the condition in each picture.  Please see my other items for sale under my account, featuring other rare finds from my personal collection.