This is an old kitchen tool.
This tool was used when an Ice Box was just that, a box that held a big block of ice.
Before refrgieration, if you wanted an iced drink, it was up to you to chip or SHAVE some ice for your drink. The Iceman would come to your house with his horse and wagon full of big blocks of ice.
The bottom of the ice shave shows the steel blade, just like a wood plane.
You pull out the bottom drawer of your ice box where the block is kept, then run the ice shave across the block until you fill your shaver. Next just open the top of your ice shaver and pour your fresh shaved ice into your glass. Well, unless you are using lake ice. In that case you might just forget the ice!