That flask would indeed be a home run if it were 19th century!
Alas, it is not. One sees this mold embossed with OLD STURBRIDGE VILLAGE at times but also unmarked on the base. These date to the 1960s or 70s.
The cobalt blue coloration is less often seen and these do have some value. Look at completed auctions on eBay
https://www.ebay.com/sch/i.html?_from=R40&_nkw=masonic+flask&_sacat=0&rt=nc&LH_Complete=1