I was wondering what was the profile of the plastic crystal on the early El Primero tonneau cased watches? So I looked at the examples in my collection, and I've got three different ones, at least. What I assume is my most original watch, the A385 Khaki, has a tall crystal whose straight-sides rise to a slight dome. From the way that the light reflects or refracts when viewed from the side, I will call this a two-storey dome. My A3817 has an unsigned crown, so it has been serviced it somewhere in life, and it sports a still-tall-crystal but different than the A385 above, one that is lower. Call it one-storey dome. Then my A3818 Cover Girl has the lowest crystal of all - slightly domed it feels almost flush to the case with almost no vertical height. Ummm ... call it a ranch-house dome? Is there some agreement about what was the first, original, El Primero crystal for this model? What is available these days as a replacement? -ez A385 A3817 A3818 Here are the three domes lined up in the same order as above: