![Keystone Wood Toys Snap Button Choo Choo Model #235](http://www.collectingkeystone.com/wp-content/uploads/2014/02/IMG_0576-2-150x150.jpg)
This is a snap together train engine. What is interesting about these snap button sets is that they are assembled with literal snaps, the same you would find on a piece of clothing. This is a model #235.
From my private collection.
The History of Keystone Manufacturing Company From 1919 to 1967