Well, I took a few minutes on the search feature to look for any postings on this one and have spent a couple of hours with google and have some questions answered. But, there remains a few unanswered ones. The camera in question is a model 521/16 with a Novar 7.5 with serial # E81235. I don't know how to identify the shutter type, it is numbered from 3.5 to 16 with a red dot placed next to the number 11. And that would be the first question. Browsing thru the old adverts on a Zeiss collector website I am assuming that it may be a Compur 00 but I did not find a clear illustration for comparison. The only other question would be date of production based on the serial number. Would that be possible? My foray into the film photography hobby is now just almost at the first year mark beginning with a Yashica TL Electro X. All my finds have been at second hand stores or estate sales and auctions. My purchase price for this ikonta was $35.00 US ( the only other thing of note I got in that box of photography stuff was a flash attachment for my Argus C3)at this estate sale. I am assuming that the deceased was stationed in Europe with the military at some point in time and acquired it then. My thanks to the people who maintain this site and you can expect a subscription soon.