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Joe_G.Ewing is among the easier HOF OJs to come by with 11 poses. The 11th pose is Ewing with Mascot and was first issued in 1889, then again re-issued in 1890. The 1889 example is what you've pictured and is easier than the 1890 example. This pose isn't difficult but its popularity seems to command a premium over the other more traditional poses. Nice card that looks authentic to me although the camera angle you chose to share looks funny.
Assuming it is authentic with only some back damage from scrap book removal, I'd place the value around $750 - $1500. The wide range is due to a couple factors including the relatively thin market OJs have combined with how well the back holds up during scrap book removal. A faint stain with all original cardboard present being better than tearing-up the original cardboard off the back, etc. The card has a better than average image and could even command more than my upper limit if it's extraction from the scrap book went exceedingly well.
There are many OJ collectors on the board that would be curious what other cards the seller has to offer, myself included.
Best Regards,
Joe Gonsowski