Help please. I have a set of Carl Zeiss 10x50 Jenoptem multi coated binoculars. They were my late uncles so I have no way to check their authenticity. I have had a pair of 7x50 and these are the same build quality. They seem to be genuine from the build. There is no DDR mark and they are in near mint condition. Excellent optics very sharp. The serial no is 108212 but I can’t seem to find any way to check this. Most on eBay serial numbers are longer. Any help would be appreciated before I list for sale. Can’t see how to add photos to this post. Thanks in advanced.