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I intend this thread to be used for identification work on the early plunger filler models of Onotos, in particular the 1000, 2000 and 3000 series. To that end, I would like to gather in here all data relating measurements to photos, and to models where known rather than presumed. I shall start with this specific question. I have recently bought two Onotos labelled 3000 by the seller, one on ebay and one from a non-ebay seller, both in Britain. Of course, these models carry no model imprint unlike later Onotos. The 3000 was the 'N' model and there was a shorter 2000 or 'O' model of the same girth. So much, I think I know with reasonable confidence. I have also seen mention of a 1000 which appears to be longer and slightly narrower although I have not found a picture or a pen positively identified as that model. Here are the two pens in question for me. The tails are pretty much lined up with the tail of the ruler, parallax suggesting otherwise. I will call them 'plain' and 'ripple'. Both pens are clipless slip-cap plunger models. This image suggesting some but not all model dimensions is taken from the custom pen parts web site. My pens have measured dimensions as below. Only the barrel diameters were measured with great precision; the others will be close enough for now: 'plain' capped length: 149 mm barrel: 85 mm x 10.2 mm section length: 24.7 mm capped weight: 10.9 g 'ripple' capped length: 134 mm barrel: 66 mm x 10.5 mm section: 28.5 mm capped weight: 12.5 g Given discrepancies, it is possible that I am measuring barrel length differently despite following the diagram. Comparing these with the table, and taking in to account the obvious differences, I am strongly inclined to the view that the 'ripple' is not a 3000 but a 2000. I also wonder whether the 'plain' may not be a 3000 but a 1000. Its length is about right but it is not much slimmer. For the purposes of this I do not make an assumption that every previous Onoto on FPN has been identified correctly. What other data do people have, that we may compare and resolve the models we each have? Including weights may be useful although clearly that is affected by how much gold / silver bling is on the pen and of what quality.