Hello I am rather new to vintage pens and I am looking to purchase a Mabie Todd Swan No.2 safety pen C1917 This is the lisiting on ebay: http://www.ebay.com/itm/Mabie-Todd-Swan-No-2-safety-pen-C1917-Superfine-xxxf-BB-No-2-nib-Serviced/252718508401?_trksid=p2050601.c100085.m2372&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D37338%26meid%3Dfc693cc1d39e460cbac892d94efef564%26pid%3D100085%26rk%3D1%26rkt%3D4%26sd%3D252718508401%26clkid%3D1871438649743035473&_qi=RTM2247625 I was wondering how much these pens usually go for and how much i should bid. I was thinking between 40-70 USD would be reasonable. Thoughts?\ Brian