[Domer05]

Back to this "one of a kind" 1918 Red Sox pennant....

I happen to know that the genuine version of this flag (sans "1918," that is) was manufactured by Annin & Co. of NY (a.k.a., A & Co. of NY). To my knowledge, it was the only professional baseball pennant ever made by the legendary pennant maker in the 20th century.

I know this because I own the 1923 edition of Annin's sales catalogue. It features a page identical to the one below....

Note that the Red Sox pennant illustrated appears exactly the same as the others previously identified on this thread as genuine.

It looks nothing like the M&N repro; and it looks nothing like this "1918" job some unscrupulous pennant maker tried to pass off as being 100+ years old. If the design had been updated between 1916 and 1918, you would expect Annin to showcase the more contemporary variant by 1923, when this catalogue was published.

Case closed: it's fake.