{"type":"firestarter.listing","listing":{"id":"lst_se5oIc_9","product_name":"Model 20 Marietta Fountain Pen - Black Cathedral","category":"Fountain Pen - Model 20","description":"\n\n\n\n\n\n\nUtilizing our classic black with a touch of color in a cathedral finial. ♦ The Model 20 Marietta fountain pen - a slip cap fountain pen that harkens back to the aesthetic of classic fountain pens of yesteryear. ♦ Precision machining and design create a cap that securely and firmly fits to the section and barrel with a firm grip. When capped or posted properly it is impossible to sling the cap off, so can be securely used in a shirt pocket or pen pouch. ♦ No exterior threads and no shoulder from grip section to barrel. ♦ The pressure is distributed inside the cap and away from the lip to prevent lip cracking. ♦ The interior of the cap has a feature that releases air pressure to eliminate the vacuum that causes ink spurts on the nib when uncapping. ♦ Filled 3 ways, via disposable cartridge, piston converter, or the eye dropper method. Barrel holds approximately 3.5ml of ink when eyedroppered.♦ #6 Size nib - with many tip options in factory or custom ground. ♦ Lifetime warranty,  converter, sample cartridges, and a 30 day money back guarantee are all included. Made in USA. ♦ Shipped with a useful Franklin-Christoph zippered pen pouch (material varies).\n \n♦ Dimensions:  5.0\" from nib tip to barrel end = 127mm5.45\" capped length = 138.43mm\n\n5.88\" cap posted length from nib tip to cap top = 150mm2.175\" cap = 55.25mm.575\" cap diameter = 14.61mm.51\" barrel diameter = 12.95mm.41\" smallest diameter of grip section = 10.41mm ♦ Weight with converter inserted but not ink is: .68oz or 19.28grams. \n\n\n\n ♦\n ♦\n\n\n\n ♦\n\n\n\n ♦\n\n\n\n\n\n\n","images":["https://cdn.shopify.com/s/files/1/0023/7679/4187/products/20BlackCathedralFP.jpg?v=1644005614","https://cdn.shopify.com/s/files/1/0023/7679/4187/products/20BlackCathedralside.jpg?v=1644005616","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/FPorderinclusions_e89b58a2-7a57-412a-b313-4d529f0de24a.jpg?v=1694800013"],"price":155,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:20.549Z"},"share_url":"https://firestarter.network/l/lst_se5oIc_9","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_se5oIc_9' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Model 20 Marietta Fountain Pen - Black Cathedral' and a budget_max comfortably above $155.00 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."]}}