When I saw this auction lot, I knew immediately it wasn't what they claimed it was:
Quote:
US Stamps #7 Used Strip/3 used as Revenue on Ohio Farmers' Insurance company from Le Roy Ohio, strip appears to be top left margin of a right hand sheet, some staining and pen cancels, CV for a strip of 3 $440

Postage used as revenues on document is one of my specializations... but this ain't one.

There was no revenue tax in 1858. No, this is simply postage paid to send the insurance policy through the mail.
That said, these are collectible in their own right, and they are found most frequently with single stamps affixed, not multiples, i.e., the vast majority from this era would have had a 3-cent stamp affixed. Also, despite the staining, it's an interesting position piece usage.
The last image below is a 1600dpi scan of the stamps, if you want to zoom in at high resolution.





