Im getting the feeling this frame might be a bit earlier than the c-record... I dont know a thing about dating derosas but the locknuts on the front wheel are '80 and on the rear its a '76 on one side and an '83 on the other... haha kinda wacky. Thinking maybe the drivetrain was a slightly later upgrade... i dunno.
but look my bench is happy swimming in a sea of vintage bits