Today, I purchased a Schwinn World Sport. Could you please help me identify its year of manufacture and assembly?

Here is some information from the bicycle:

• The "Schwinn Quality" head badge is round, affixed with two rivets, and stamped with "3426".
• The bottom bracket is stamped with "GL631940".
• The seat tube has a sticker reading "CRO MOLY 4130 DOUBLE BUTTED MAIN TUBES".
• The down tube has a sticker reading "Made in Taiwan".
• It has 12 "speeds".

Based on this SLDB Serial Numbers webpage, I think the frame was manufactured in July 1975 and the bike was assembled in December 1976 (day 342 of 1976). Is this (likely to be) correct?

Please let me know if any other information from the bicycle might help the identification process. Thank you!

Christian