Hello, can anybody tell me what this tool was used for? I can barely make out an atha stamp on it. Thank you!

It's a ships maul, used for driving pins in & out of rigging, sometimes called a top maul.

Thank you! 

I've also seen it called a riviters or a boilermaker's hammer.

Steve

All boilermaker's hammer's I have seen had had a rounded peen or face for setting the fire tubs.   While it may have originally been used for ship work I have found them in Central Ohio and here in the desert in a mining area too.  So a fairly wide spread item; However I was greatly surprised to not see it in the 1897, 1905 or 1908 Sears Roebuck catalogs; of course I only checked the index for hammers, sledges and mauls and skimmed a bunch of pages in those areas.

If you do a net search on Atha ship maul you will see a bunch of pictures of them.

Thanks Thomas Powers I bought it at an auction about a month-and-a-half ago. It was in a lot of tools. Well we have strip mines in Ohio, big shipping on Lake Erie and boiler makers around here. If that's the case what would be the purpose of the faceted sides? 

Okay did a quick Google search and I actually found some place that says the ship maul is used for plugging holes?!  Anyways thanks for the information I didn't even know what the tool was called.