So after becoming obsessed with figuring out what frame I have and reviewing all the info on the forum and calling a shop in Arlington that sold these bikes in the 70s. I've become convinced that I have a

1977 Sekai 2700 Competition model. I was told the first number in my sequence serial number designated the year. and that the frame having no braze ons was consistent of frames of that year range.

Ive found at this point many other Sekai's 1977 / 76 that carry identical dropouts and share the exact same fork and crown. The bike rides great so none of this really matters but its fun to figure out. and I will probably do some restoration in the way of paint and decals.

I looked at T-mars data on serial #s and it was a little confusing for me but I've seen many of his posts and they also have helped in my conclusion.