{"type":"firestarter.listing","listing":{"id":"lst_Oy2jzmQd","product_name":"Model 20 Marietta Fountain Pen - Black Sea Glass Andromeda SE","category":"Fountain Pen - Model 20","description":"♦ Presenting the Model 20 Marietta fountain pen - a slip cap fountain pen that harkens back to the aesthetic of classic fountain pens of yesteryear. This edition features a  a black cap and antiqued Sea Glass, which is a darker shade than our normal Antique Glass. The original release of this had a sparkling green section which has now been replaced with the Diamondcast colorshift material we call Andromeda. Note that like all our antiqued materials, these barrels can glaze / frost over time as part of their natural aging process. Limited in production, so classified as a special edition. \n\n**The photos are all of the new version except the last one with a black background to compare to the original version. With the new colorshift section, it will appear more green from straight one and darker and blue from angles.\n\n♦ 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. ♦ In lieu of a traditional gift box we ship with a Franklin-Christoph single pen zippered pouch (material varies) with an outer white thin box. \n\n \n♦ Dimensions:  5.0\" from nib tip to barrel end = 127mm5.45\" capped length = 138.43mm\n 5.88\" cap posted length from nib tip to cap top = 150mm2.175\"","images":["https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20BlackSeaGlassshiftFPopen.jpg?v=1762457290","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20BlackSeaGlassFountainPennoclip_7ad3ce3f-eb77-4ffb-8ead-6ad4b1a49679.jpg?v=1776346762","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20BlackSeaGlassAposted.jpg?v=1776346762","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20BlackSeaGlassFPshiftblue.jpg?v=1776346762","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20BlackSeaGlassApostedgreen.jpg?v=1776346762","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/20BlackSeaGlassposted_76cf8928-8b88-42c1-8fd8-1852d5af8fc4.jpg?v=1776346762","https://cdn.shopify.com/s/files/1/0023/7679/4187/files/FPorderinclusions_f6b2280a-0650-4f6f-9acd-5bf7ad4e90dc.jpg?v=1776346762"],"price":170,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:20.204Z"},"share_url":"https://firestarter.network/l/lst_Oy2jzmQd","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_Oy2jzmQd' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Model 20 Marietta Fountain Pen - Black Sea Glass Andromeda SE' and a budget_max comfortably above $170.00 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."]}}