A typical example of a late 70's Sekai 2700.
Sekai Bicycles:was bought out in 1983 by Norco, Production of Sekai Bicycles stopped in 1990 completely.
I'm going to attempt to put as much information as possible about Sekai bikes here in this thread, if you have something to add or correct etc please chime in.
Backstory for the company
Article on History/Value in current market
Dating by serial
Credits and thanks for links/info: T-Mar as can be seen throughout this thread, yellowjersey cyclery, retrobike.co, classicrendezvous.com, Don Gillies,re-cycle.com, sekaibmx.wordpress.com and anyone who posted in this thread or PMed me more info..