Hi, I'm fully aware of the Flightmaster 145.036 had circular grained finish and Mark III had both sunburst and circular grained finish, having owned quite a few 166.071 Memomatics I have never in my life seen circular grained finish of the case and the Memomatic you are reffering to is not a new old stock watch, I can see from miles away that this watch has been refinished with incorrect circular grained finish. To answer the question about the case shape, Memomatic 166.071 case is completely different from Flightmaster case 145.013, 145.026 and 145.036, case is is much smaller on Memomatics and it has acryllic crystal instead of miner crystal.
I will send you a box of chocolate if you find a new old stock Memomatic with circular grained factory finish of the case
馃榾
Cheers
Stefan