These are a pair of Snyder style bats that date definitively to 1875, but research supports this model/style of bat being available and used back into the mid-1860s.
Period photography, such as this CDV recently offered in Hunts shows...upon close inspection...a fully milled down, wound handle bat with flat top barrel exact to the pair in my collection and seen in the 1875 Snyder Sporting Goods catalog.
The lighter grained example being the Ash or Willow variety with the darker one being the Fully French Polished exemplar.
Jonathan
www.dugouttreasures.com