Binder-Optik, a small German chain of optical stores run by Helmut Bauer, was going to go public, but then decided last month to postpone the stockmarket introduction until it reaches a minimum annual turnover of at least 100 million DM (e50m-$40m), possibly through acquisitions of smaller chains. In the 1999 fiscal year, its sales grew only slightly to 56 million DM (e29m-$24m) from 55 million DM in the previous one.