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Type: galaxy, S0
Mag: B=14.8, V=13.8
Size: 0.5′ x 0.3′
NGC 7575 is probably CGCG 406-044, just one degree south of Marth's otherwise not-too-badly-determined position. The description matches, and the considerably fainter galaxy just to the south would probably have escaped Marth's attention.
The identification as a star (by Reinmuth, copied by Carlson and RNGC) seems less likely given that a "Faint, small, very little extended" nebula would be well-seen in a 48-inch telescope. Still, Marth has probably picked up a few other stars, so this remains a possibility, however -- ahem -- faint.
Another, even less likely possibility, is that N7575 is NGC 7562 with a 1.3 minute error in RA. The one-degree digit error strikes me as a better bet.
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads * DC.
The Messier objects
The Bennett objects
The Caldwell list
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