The service listed on the 2 applications for membership listing Robert Mason as the patriot have been questioned regarding his service. It appears there is question if the service provided was for this Robert Mason or perhaps another man with the same name. The service quoted was for the 5th Vol Regt Continental Line and the source was Historical Register of Virginians in the Revolution page 505. There is another Robert Mason who has been approved
Service:
VIRGINIA Rank: SOLDIER
Birth:
CIRCA 1750 WINCHESTER FREDERICK CO VIRGINIA
Death:
POST 1783 WINCHESTER FREDERICK CO VIRGINIA
Service Source:
NARA, M881, COMP MIL SERV RECS, ROLL #982
Service Description:
1) CAPT ANDREW RUSSELL, 5TH REGT
I believe this is the same service that caused your Robert Mason to be questioned. I believe you would need to find different service for your Robert Mason.