carbon fiber mountain bike frame rare retro vintage mtb sbike mantis

Good condition, no cracks, no dents, straight and true, all threads are clean and sound. Shows signs of wear from usage and storage (cosmetic marks such as dings, scuffs, scratches, and abrasions). The last three images were borrowed from google.
Specs, Measurements, and Details:
-Frame size: I would call this a Medium
-Wheel size: 26" (can accommodate a maximum tire width of 2.5")
-Top-tube length (center of head-tube to center of seat-tube): 22"
-Seat-tube length (center of BB-shell to top of seat-tube): 18.5"
-Chainstay length (center of BB-shell to center of dropouts): 16.75"
-Dropout spacing (hub width/OLD): 135mm
-Head-tube length: 128mm long/tall
-Head-tube ID (internal diameter): 34mm
-Headset size (fork-steerer diameter): 1-1/8” (28.6mm)
-Seatpost hole diameter: 29.8mm (takes a 32mm size clamp/binder/collar)
-Front derailleur type: BB-shell mounted (bottom pull, or top pull with built-in replaceable roller)
-Bottom-bracket shell width & thread type: 68mm wide, English/BSA
-Brake type: compatible with cantilever rim brakes using the integrated internal cable stop/hanger (it will also work with magura-hydraulic or any side-pull v-brakes if the hole is enlarged so the cable can run all the way through it)
-Construction: monocoque (single-piece) with internal cable routing (full housing)
-Material: carbon fiber mainframe; aluminum dropouts, BB insert, SP tube, and HT sleeve; steel brake posts/studs/bosses
-Origin: Made in Poland by Insgraf, circa mid 1990's
-Weight: 2198 grams (as shown)
Asking price includes 15% eBay fee.
Multiple payment options available.
Worldwide shipping is possible.
Local pickups are welcome.
Thanks for looking!

Returns Accepted for this item if it's within 30 Days