This papercraft is Vindicator IV Lion Warriors, from KSYTA. The Lion Warriors is a Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Nothing else is known about the Chapter in Imperial records.
The Vindicators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.
The Lion Warriors' Power Armour is painted gold with black shoulder plate insets, Aquila and Chapter markings. The shoulder plate trim is gold. The Chapter badge is a gold lion head on a black background.
The Vindicators' Chapter colours are not listed in current Imperial records. The Vindicators' Chapter badge is not listed in current Imperial records.
You can download the Warhammer 40k paper model here: Warhammer 40k - Vindicator IV Lion Warriors Free Paper Model Download