{"type":"firestarter.listing","listing":{"id":"lst_FMX58pkF","product_name":"Magna Carta Mag 1000 Oversized Fountain Pen 13","category":"Fountain Pen","description":"  The Magna Carta Mag 1000 fountain pen boasts a remarkably large size and features one of the largest fountain pen nibs on the market.\n\nReviews On YouTube\n\nProduct\nMagna Carta Mag 1000 Fountain Pen Oversized \nDescription\nThe Magna Carta Mag 1000 Oversized Fountain Pen features a 24K PVD gold plated trim and a massive #10 steel nib in Fine, Medium, or Broad sizes. Drawing inspiration from the vintage Waterman No:20 fountain pen, the MAG1000 boasts an exclusive #10 nib, making it the largest pen in Magna Carta's collection, even surpassing the Namiki Emperor. Each pen includes an ebonite feed housing and a standard international converter, with the option to convert to eyedropper filling.\nSpecs\n\n\n\n\n\nCondition\nNew\n\n\nBrand\nMagna Carta \n\n\nType\nFountain Pens\n\n\nColor\nCustom\n\n\n\nDemonstrator\nNo\n\n\nBody Material\nResin\n\n\nCap Rotations\n2\n\n\nCap Type\nScrew-cap\n\n\nCompatible inks &amp; refills\nBottled inks, Standard international cartridges (Schmidt K5)\n\n\nFilling Mechanism\nConverter (one included), Cartridge, Eyedropper\n\n\nGrip Material\nResin\n\n\nNib Size\nF,M,B\n\n\nNib Color\nGold\n\n\nNib Material\nSteel\n\n\nPostable\nNo\n\n\n\n\n\n\n\n\nTrim Color\nGold\n\n\nDiameter - Body\n16.5mm (0.65in)\n\n\nDiameter - Cap (without clip)\n18.4mm (0.72in)\n\n\nDiameter - Cap (with clip)\n\n 23.2mm (0.91in)\n\n\n\nDiameter - Grip (mm)\n13.8mm\n\n\nLength - Body - Inc Nib\n154.1mm (6.07in)\n\n\nLength - Cap\n74.5mm (2.93in)\n\n\nLength - Nib\n38.0mm (1.50in)\n\n\nLength - Overall (Closed)\n158.6mm (6.24in)\n\n\nWeight - Body\n22g (0.78oz)\n\n\nWeight - Cap\n14g (0.49oz)\n\n\nWeight - Overall (g)\n36.0g\n\n\nMax Ink Capacity - Cartridge\n1.58ml\n\n\nMax Ink Capacity - Converter\n1.08ml\n\n\nMax Ink Capacity - Eyedropper\n9.25 ml\n\n\n\n\n\nFeatures\n\nThe cap posts, but designed for writing balance with or without the cap posted and not suggested.\nNib: Magna Carta Still #10 \nFilling System: Cartridge / Converter Filled (Standard International K5 converter included)\nAlso can be used as an eyedropper.\n\nNib Sizes\n#10 size Steel nib.\nPackaging\nComes in cardboard pen box.\nMagna Carta\nEsta","images":["https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-13.jpg?v=1741729086","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-13-2.jpg?v=1741729088","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-13-3.jpg?v=1741729090","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-Black-Ebonite-3.jpg?v=1759310183","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-Black-Ebonite-4.jpg?v=1759310186","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-Black-Ebonite-5.jpg?v=1759310189","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-Black-Ebonite-6.jpg?v=1759310193","https://cdn.shopify.com/s/files/1/0575/7177/files/Magna-Carta-Mag-1000-Oversized-Fountain-Pen-Black-Ebonite-7.jpg?v=1759310197"],"price":410,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:45:59.982Z"},"share_url":"https://firestarter.network/l/lst_FMX58pkF","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_FMX58pkF' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Magna Carta Mag 1000 Oversized Fountain Pen 13' and a budget_max comfortably above $410.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}