Are you certain of the spelling? There were a number of Japanese-made enlarging lenses that appear to be identical other than branding. One of these brands was Aetna. The 105 mm f/4.5 Aetna Actinar is sometimes seen for sale as an eBay offering.
https://www.ebay.com/itm/FULLY-REFU...557235?hash=item2cc891c473:g:kTAAAOSwBkRZ74zw
Mine are 50 mm f/3.5 and 75 mm f/3.5. Mine are branded EL-Omegar for the Omega enlarger maker. They produce good images provided that the negatives are kept flat in a glass carrier. In Black & white printing, the constrast is slightly less than with more-expensive lenses. That contast difference is easily eliminated by choosing a filter 1/2 contrast grade harder than I’d use with EL Nikkor, for example.