I believe I can date this find exactly - not generally easy of course. I am practically certain that this pen was sold in 1952, the year that Mabie Todd & Co Ltd became (so sadly) Biro Swan Ltd. Who here has heard of a Swan Jackdaw? No, neither had I! But here it is: The pen is pale green and correctly stamped 3172 at the end of the barrel. Note the sticker added to the box - the missing part of the Biro Swan sticker shows a number - 41; this box is therefore old stock carrying the former W1 address of Mabie Todd - 41 Park St, Mayfair. Jackdaw? Have a look: I believe I can imagine that at what remained of Mabie Todd at that time, there was chaos. There would have been half-finished pens everywhere, people sticking Biro Swan stickers on old boxes &c. I suppose they thought that they might resurrect the Jackdaw name for cheap line pens - like this one with its No 1 size and chrome-plated fittings. However the pen is a credit to its makers and apart from the nib is in excellent condition. The pen came with a rather nasty bi-coloured stainless steel nib. Fortunately I have Swan 1 nibs and feel inclined to restore the pen to its former Mabie Todd glory - when it was manufactured, just before nemesis struck and the over stamping and stickering began! I am certain that Mabie Todd and even Biro Swan, never sank to fitting steel nibs, preferring to close their doors in 1958 or thereabouts. All the best Cob