Hello, JBMorrow.
Your key of G Hohner Echo #1494/28 was made circa 1950s-'60s (a guess),
judging by the box. Your Echo has 2 double rows of 14 reeds each row
(28 reeds, and starts on B as it's lowest pitched reed (left side).
It is 4.5" long, and it's an octave harp, with the lower pitched reeds on the
top horizontal row, and the higher pitched reeds on the bottom horizontal row.
It was made from circa mid 1930s to the present day, in it's present form,
unchanged, except for the bottom metal cover (plated brass), which has
no star in the hands & circles trademark.
The hands & circles Hohner trademark has had no star in the center of
the circle(s) since 1937, when the German government ordered Hohner
and other German harmonica companies to remove the hexagon star
from the companies' logos.
So, your Echo was made sometime after 1937. If you read the medallions
on both sides of the hands & circles logo, cities and years are listed.
Your harmonica was made after the most recent medallion year.
A few Hohner Grand Prix Trade Fairs and Exhibitions awards:
Ulm, 1871; Wien (Vienna), 1873; Philadelphia, 1876; Stuttgart, 1881;
Chicago, 1893; Paris, 1900; Villagen, 1907; Philadelphia, 1926;
Geneva, 1927; Paris, 1927; Chicago, 1933-'34; Paris, 1936-'37.
Best Regards
John Broecker