When I bought this pen I assumed that it was an English W3. It’s the same style and size but it’s actually an American pen. Not being well up on the lesser US Watermans, I don’t know what it is, and the barrel imprint is worn, so that doesn’t help. To complicate matters further it has an English 2A nib, probably a replacement.
In Britain, Waterman was using the combination of that clip type with the striated plastic in the mid to late forties, and I’m assuming that this pen also will date from that time. It was an unfortunate period for Waterman. Quality was not what it had been and it shows in this example. The nickel plating is worn on the clip, showing the brass beneath. There are a few scratches and some wear on the plastic, which is quite soft.
Actually, though, none of that matters at all. The pen’s sound and it’s fitted with a nib to die for. I’ve had much fun practicing my curlicues with it this morning.