I just bpught a Yashica J-P with an Asahi Opt. Co Super-Takuma 1.8/55 lens that appears identical (other than the missing R) to a Super Takumar currently on my Pentax H1v. The lettering is engraved, so it doesn't seem plausible that it' came off, but it seems like an unlikely defect. Is there a difference between Takuma and Takumar?
They are the same. I read in another forum that in some countries to get round excessive import charges names were altered on some cameras and lenses. I think that will be it. The lens says Asahi Opt Co. so I'm pretty sure it is a Takumar. I'm guessing probably imported into the US
The lenses made by Asahi were named after the artist and photographer Takuma Kajiwara, the r being added to make the registered Asahi Opt Co trademark. It may have been an early version, but that seeems unlikely as they had used Takumar for many tyears, or it was a Home Market test run.
All Japanese cameras had to be sold on the Japanese home market for about 6 months before they gained to right to have the gold sticker added to the export versions. These camera were often different in details to identify them as the test run models, and not officially for export.
They got used as trade samples though, and "escaped" in other ways.
The gold sticker did not relate to the individual camera, it was only a general certificate that the camera model met, or exceeded, the required export standards.