Although I searched for NS Meyer and keywords like boat, ship, Navy, Coast Guard, and Merchant Marines, I didn't find a match. Another Tnetter probably has a catalog of these and will ID. Until then I think the pin is from the early 1930s as it is the only hallmark that lacks "INC." at the end of NS Meyer. From the website
https://www.usmilitariaforum.com/forums/index.php?/topic/16492-meyer-ns-meyer/
N.S. Meyer markings
In the 20’s : screwback, “N.S. MEYER, INC. NEW YORK” (raised), no shield
Early 30’s : screwback,
“N.S. MEYER NEW YORK” + shield (engraved).
Mid 30’s to 1943 : screwback, “N.S. MEYER, INC. NEW YORK” + shield (engraved).
WWII : pinback, “N.S. MEYER, INC. NEW YORK” + shield (raised)
Late 40’s : Shield only (raised)
Late 40’s to early 50’s : “N.S. MEYER, INC. NEW YORK” + shield (raised and ? size)
Early 50’s : “N.S. MEYER, INC. N.Y.C” or “N.S. MEYER, INC. N.Y.?” + shield (raised)
Mid 50’s to Mid 60’s : “N.S. MEYER, INC NY” or “N.S. MEYER, INC NEW YORK” + Shield + 9M (raised).
Mid 60’s to mid 70’s : N.S. MEYER, INC. NEW YORK” + shield + 22M (raised)
Since mid 70’s : N.S. MEYER, INC. NEW YORK MADE IN USA” + shield + 22M (raised).
Source : Militaria magazine, issue 272, mars 2008, p. 43.