They look just like the '70s Zenith that I borrowed from my dad.
Check if there's a JB number near the front of the hinge, that will tell you who made them.
Thanks for the feedback, Mark9473. I looked on the binoculars for other markings besides those in my original post. There are a few:
- Manufacturing inspection sticker on center post - "PASSED Japan Telescope Inspection Institute"
- End of center post, plate held on by Philips screw - JAPAN
- Front saddles hinged on center post:
Left - [check symbol - looks like square-root sign]-B81
Right - [check symbol - looks like square-root sign]-E54
I wonder if the marks at #3 are manufacturer's part numbers.
I had an opportunity to try viewing the Moon and Jupiter a few nights ago. Then I discovered the binocs were out of collimation. The misalignment was perhaps 3/4° in horizontal and 1/2° vertical. With considerable effort my eyes could merge the images. But I'll need to get collimation adjusted before much further use. Since the left and right prism cases have a flat plate held on with screws, it looks easy to gain access for prism adjustments. The eyepieces will need to come off first. So I'll likely try to do the job myself.
Seems like I saw some instructions (by Glenn LeDrew?) on this forum on how to proceed. If successful, I may then try collimating my 15X80 binocs. For now the 10X50s seem similar in construction to my 7X50s from the mid 1960s (see info under my signature). Seibert Optics can do the job for around $100 each plus shipping. For that I'll likely see if they can be collimated by myself, leaving more funds available for other necessary purchases.