Hi there. I recently bought these Juliets second hand with no box. They are x metal in colour with what look like a dark reddish iridium lens. They don't have a serial number on them (see third picture), and a strange indentation where the serial should be. The first photo is in natural light on a cloudy day. The second photo is under artificial "cold" LED light. As far as I know, they haven't been resurfaced/resprayed. Which model Juliets are these? And how can I tell if these are aftermarket lenses or original? I haven't Thanks in advance.