[Butch7999]

A marvellous thing there, boysblue -- in close to thirty years collecting and researching tabletop baseball games,
we've never run across hide nor hair of that game from any source.

It's definitely a 1946 product, give or take no more than a year -- the hypothetical battery listed on the instruction sheet
features "Podjhanny" and Lollar, undoubtedly referring to Johnny Podgajny and Sherm Lollar, teammates at Baltimore
in 1945 and '46.
Pardon a correction, but Jersey City were in business through 1950 -- they were relocated to Ottawa in 1951.
Springfield replaced Newark in 1950. The eight teams included in the game constituted the IL from 1938 through 1949.

Tough to estimate a price, but we have seen at least one other IL-centric boardgame from the same era,
very comparable in fact to yours in composition and condition -- "Baseball Magnates" by the Bill Sims Syndicate.
The only example of that game we've seen sell went for about $75. several years ago on eBay.