I got this at a local flea market today and really didn't think I would ever find one with the screw on cap. The lava color is hard to explain, like a lime green (not yellow). It's only been running for a few hours thus far. Have no clue on it's age since it's my first screw on cap model. Fluid is real clear. Guy I got it from said he had it a long time. I told him it's going to a good home that will enjoy it. Oh I am using a frosted bulb as I am not sure if the clear bulbs can be used on the older lamps. WATCH IN HD for better viewing results.