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Do you have any photos? Does it look like a standard Tamaya sextant from that period? There are quite a few Tamaya-like sextant brands which were fundamentally Tamayas with some small variations in optional hardware (like shades) and with unique labeling for commercial partners. I have had good success with a couple of these instruments over the years, but it's not clear to me that they are as good as the best with the proper Tamaya brand. The re-branding may have been a convenient way for Tamaya to sell some stock that was not quite "top shelf".

Frank Reed