I believe that Martin bought Levin simply because they had a vast stock of good tone-woods ??
I was in Singapore in 1967/68 when Yamaha guitars were all the rage ( FG 180 ?).
In about 1970 I bought , in Gosport, a Suzuki with an adjustable bridge, and it served me well until after 2000, when it went in part exchange for my Avalon.