I'm now home for the day with access to my images. Leon, your tintype was long ago created from this Vermont Find glass plate negative (I managed to obtain several negatives including this pose of Mathews).
These original negatives vary in quality, but some such as this Mathews batting pose are simply amazing.
I've written about this image and others in past. This photo (negative) was from Gilbert and Bacon in 1888. A neat aspect of this pose is that Mathews is holding a very early Louisville Slugger bat.