As a first impression:
— At first blush the offer seemed attractive.

synoniem: when first seen.

Roget 525: manifestly, openly etc. adj.; before one's eyes, under one's nose, to one's face, face to face, above board, cartes sur table, on the stage, in open court, in the open streets; in market overt; in the face of day, face of heaven; in broad daylight, in open daylight; without reserve; at first blush, prima facie [Lat.], on the face of; in set terms.    ... meer laten zien