Ribbed Fountain Pen, Unknown German Manufl - Stainless Steel 7 Gold

eBay

Exact match for the fine vertical ribbed barrel and cap design, Matching bright gold color, Classic fountain pen nib style and color, Overall form factor and proportions are consistent, Black section where the nib attaches matches

Vtg Rjr Tobacco Co Sheaffer Fountain Pen Gold Color Ribbed Texture

eBay - dressbroker

Gold color matches exactly, Ribbed barrel texture is highly similar, Appears to be a fountain pen, Overall form factor and design are consistent

Scriveiner Fountain Pen Gold – Fine Nib Luxury Writing

Office Depot

Gold color, Fountain pen category, Ribbed barrel (general), Gold nib