Star Micronics SP300 RC300P Series Compatible Purple Ribbon - SP300, SP312, SP317, SP342 (NEW).

Fits all these printers as well:

Dassault CDT Journal, Dassault Procash 2050 Journal, Dassault Procash 2100 Journal, Dassault Procash 2150 Journal, Dassault Procash 3100 Journal, Dassault Procash 400 Journal, Datamega DPN-3110, Datamega DPN-3120, Everex Retail System, IBM 4614, IBM Sureone, Konic Electr. System I, Konic Electr. System II, Konic Electr. System III, Panasonic JS-7500 Slip, Panasonic JS-8000 Slip, Panasonic JS-9000 Slip, Panasonic Mcdonald POS System, Par Microsystems Micro-3, Posiflex PP-3000, Samsung ER 350, Samsung ER 550, Samsung ER 655, Samsung ERP-200, Samsung SMP-200, Samsung SRP-100, Samsung SRP-200, Samsung SRP-250, Star Micronics MP 300, Star Micronics MP 312 F, Star Micronics MP 317, Star Micronics MP 321 S-24, Star Micronics MP 322 S-24, Star Micronics MP 323 S-24, Star Micronics MP 342, Star Micronics MP 347, Star Micronics MP 352 S, Star Micronics MP 382, Star Micronics SP 300, Star Micronics SP 311, Star Micronics SP 312, Star Micronics SP 316, Star Micronics SP 317, Star Micronics SP 320, Star Micronics SP 321 Sprocket, Star Micronics SP 322 Sprocket, Star Micronics SP 323, Star Micronics SP 341, Star Micronics SP 342, Star Micronics SP 347, Star Micronics SP 348, Star Micronics SP 349, Star Micronics UP 389, TEC FDS 300, TEC RKP-300, TEC ST-5500.