This is the SMW Beta Hammer Bro from an official screenshot released on a Nintendo's interview in 2017. In this 1989 photo, the sprite has no arms (at least I can't see them), because the sprite probably wasn't finished yet and was scrapped soon. So I added the arms to be compatible with Hammer Bro sprite on SMWCentral (I included the body part without the arm too). The arms have the same style of Koopa Troopas, so do not worry about that. Also, this graphic can be useful for those who want to maintain the vanilla feeling of the game.
Probably the sprite in the beta version was green because, on this 1989 screenshot, we can see that every sprite has your own correspondent palette (p-switch, wood platform, cheep, key). Also, in Super Mario Maker, the SMW version of the Hammer Bro is green. Because of that, do not forget to change the palettes to 5 (green) on .cfg of the sprite!
Sprite to use with this graphics: https://www.smwcentral.net/?p=section&a=details&id=16730