Moby Grape at The Ark or The Matrix. Trio of 1966, 1967 Posters for Moby Grape Concerts at The Matrix in San Francisco, and The Ark in Sausalito, including: Poster for Moby Grape at The Ark, Feb. 1967. Likely a second printing without ?Litho U.S.A.? after the Portal Productions notice. 22 x 16?. Some pinholes, a small 1/2? margin tear and light edge wear. A-. And Poster for Moby Grape at The Ark, Oct. 1967. 22 x 16?. Very good with some marginal light soiling, bumping and light creases to the margins. No pinholes. A-. And Poster for Moby Grape at The Matrix Tues. Dec. 6-8 1966. (AOR-2.107-OP-1). 22 x 14?. There is a 4? chip to the left margin and some staining, especially to the back of the poster. B+/B.