Star Trek TOS Magnet-Back Service Insignia

These ST:TOS chest insignia take two 8x2mm magnets in slots on either side.

Several designs are non-canon.

Collection includes:

• Command Division
• Sciences Division
• Supply/Logistics Division
• Trombone Division
• Intelligence Division

The Engineering/Security division insignia is available separately as https://www.thingiverse.com/thing:5551320

Trombone image derived from https://www.thingiverse.com/thing:54182 by trbone76.