Hammered Penny, ID And Valuation Please

OK. First impressions Mash. Genuine. Voided long cross penny.

Says Henry III as far as I can tell. Needs a bit of research for the specific class. Maybe .. 3b, though not my area I'm afraid.

The reverse might be confusing you? That's because it's double struck. 90% sure it says NICOLE ON LVND as the moneyer.

Price? Again, not my area. But they seem to be listed for £50-£100. Yours looks quite nice IMHO.

Yes. Milled coins are made to be near identical. So any differences tend to be unusual and have curiosity value.

Milled coins are usually doubled because the dies have been adjusted or re-struck because parts were getting worn and the detail was unclear. Examples are generally scarcer than those from unaltered dies. Plus details like that can help identify which coins were struck from the same dies. Sometimes they are even considered new varieties as a result.

Hammered coins are all individual. The blanks would often jump a bit between strikes so taking the image twice or more. Generally these don't command any premium and if the doubling obscures the design significantly, can reduce the value to a collector.

On yours the doubling doesn't cause too many problems and one can still guess at the moneyer. The obverse is unaffected and central so you probably won't lose by it. But you won't get a premium either!