Based on this product's specifications, here are some alternatives and similar models
Fountain pen Diplomat Elox Ring F — black/violet finish, fine nib
Summary description:
Diplomat Elox Ring fountain pen with a fine (F) nib in a black and violet anodized finish. A refillable writing instrument designed for everyday writing, signatures and note-taking. Features a precision metal nib in fine width and a durable anodized body with decorative ring detail, compatible with standard cartridges or converters for liquid ink.