Resident Evil 7: Biohazard · Weapon unlock
Circular Saw
Circular Saw is named in the supplied weapon list. The unlock guide says it can be unlocked by completing the game in under four hours on any difficulty.
How it works
The guide gives the unlock condition as completing the game in under four hours on any difficulty. The weapon list confirms Circular Saw as a weapon, but the supplied evidence does not classify it as melee or describe its combat effects, operation, or restrictions.
Read the supporting references
Steam-Community :: Guide :: Resident Evil 7 Overview of Unlockables Weaponry (Resident Evil 7 Biohazard) | Evil Resource
Check the edition and source version for patch-specific details. Guide methodology.