Limited edition RAT FINK pen by Acme pen Co

This is a limited edition RAT FINK ink pen by the Acme pen Co. Only 1963 were made and each pen is numbered on the cap! This is number 0731. The tin box this pen came in has a dent on the back of it (I bought it that way) shown in photo, but otherwise the pen is in practically MINT condition!! The original ink cartridge is still working and hasn't really been used just stored. Collectors Item!!!!! Current market value is listed at $750 for just the pen alone! NO low-balling on this please :)