Dyfed-Powys Police is investigating an assault that took place around midnight on Saturday, June 1, in Tenby.
A man was involved in an altercation with another man at The Esplanade.
The victim suffered significant injuries including a fractured skull and eye socket.
The suspect is a white man, around 6 foot 1 inches tall and slim build. He has dark hair and was clean shaven. He was wearing a white shirt and possibly carrying a light-coloured jumper over his shoulders.
Anyone with any information is asked to Dyfed Powys Police on 101 quoting crime reference DPP/0005/01/06/2019/01/C or alternatively anonymously via Crimestoppers on 0800 555 111.