The 1/1 copolymer of meta-acetoxybenzoic acid and 2,6-acetoxynaphthoic acid (ANA), prepared by constrained thin film polymerization, crystallizes from the liquid crystal state during polymerization as single disclination domains and lamellar single crystals in the thinnest regions. Lamellae are also seen in the thicker regions. A sublimation-recrystallization-melting-polymerization-crystallization process occurs isothermally, at temperatures below the melting point of the ANA. Infra-red spectra confirm the polymerization and indicate the presence of both monomers. Electron diffraction from the single crystals indicates a phase I structure, similar to that in poly(p-oxybenzoate), with a doubling of the b axis dimension in some crystals. Electron diffraction from sheared samples, after annealing, suggests formation of poly(oxynaphthoate) blocks; the as-sheared samples have only a single c axis reflection (2.1 angstrom).