Curved Chainstay - What is this bike?

[tttrickyyy]

Hi Crew!
Seeking some help to identify this bike. The chainstay curve is something I have never seen before.
Unfortunately it has been painted and has no decals so I don't have any information on it, but apparently it is an American brand.

Let me know what you think?
Cheers
Mike

 

[RustySprockets]

Can't say I've seen a frame like that one, but it sure looks like a candidate for belt-drive.

 

[wheelbender6]

Looks like a Mrazek, made in the Czech Republic.

 

[rickpaulos]

similar to an older Decathlon (or B'Twin)Triban Trail 5 (or 7). Looks like there were several versions with 7 or 21 gears. All appear to have had a shock fork that might have been changed out for the repaint.

Serial number readable?