The early BN/Manhattan discs were imported from Europe. Bad mastering and bad pressings. Later they changed to NY masterings and pressings from Wakefield Mfg. (my old pressing plant in Phoenix). The NY/Wakefield discs are much better, but not perfect. When I spoke to the folks at Wakefield about this, they complained about not being able to control all aspects of manufacturing.
Ah, old vinyl stories of the 60s, '70s and '80's.