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The combination of fade paint scheme and scrolly chrome lugs makes me think we are looking a a Mondia Special.

The grey splotch at the bottom of the photo looks like something caused by a spill/splatter of a corrosive liquid.

From the photo it is guesswork to speculate on the line/scratch at the top of the image. It could be simply a scratch or a mark where something was erstwhile attached.

One would want more/better imagery or an in person inspection.

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