Well, it is the concave side of one element - and they are chips. I had nothing to lose and had it apart. It's the leading (front-side) element which, I thought was the crown portion. The set is air-spaced. They were isolated by a thin "gasket" running between them at the perimeter. And I said old, but not quite that old. (60's vintage Sears Discoverer 6333-A). Darrell -----Original Message----- From: sac-forum-bounce@xxxxxxxxxxxxx [mailto:sac-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Paul Lind Sent: Wednesday, October 15, 2008 8:26 AM To: sac-forum@xxxxxxxxxxxxx Subject: [sac-forum] Re: Looking for a 60mm f15 objective Darrell, Does that scope have Galileo's signature on it? Oh, I forgot, he used a singlet objective. Is it really the crown that's chipped? Generally the concave side of the flint elemenet gets chipped. Also, are the elements cemented? Cement failures can look like chips. Paul ----- Original Message ----- From: "Spencer, Darrell" <DSpencer@xxxxxxx> To: <sac-forum@xxxxxxxxxxxxx> Sent: Wednesday, October 15, 2008 7:11 AM Subject: [sac-forum] Looking for a 60mm f15 objective Not sure if folks here are as interested in older refractors as I am, but I have yet another project that's old, complete and in really pristine shape ... except for the crown half of the objective. Clamshell chips all the way around. If it was a 102mm, I wouldn't worry much, but at 60mm, I'm going to try and find a replacement. If anyone happens to have an unused "cell" they'd like to "sell", I'd sure be interested. (D:60, F:900) Thanks, Darrell Spencer