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Before you make your mind up about whether to repair or not, you might like to consider the work of the American who runs this service: http://www.crs-stockton.com/index2.html The before and after photos are impressive, BUT I have not seen his work on anything hammered, so can't say how he would perform on your coin. Let's just say that he has done a fantastic job on the coins shown on his website. If you didn't want to use this guy, then I would certainly echo the points on here about not having it crudely plugged, as that will only make things worse.

It's the crown on the JH portrait that makes it look silly (IMO) and is why that portrait was so unpopular at the time. You might be interested in this adaption I did in Photoshop, showing it without the crown (apologies for the JPEG artefacts): To my mind, it looks more dignified. Also, in Peck there is a plate showing a pattern for a bronze JH portrait where she's wearing the same crown as on the Old Head bust, i.e. much lower on the head - it looks so much better.

It doesn't really matter whether you leave it alone or plug it. If you do decide to plug it, get somebody who knows what they are doing as you still have the potential to reduce its value by doing a bad job. With or without hole, it is still impaired however rare. It's a pity it was holed as the reverse is quite good.

It's worth £350, i think that's the price you paid on ebay for it, i was watching it too but eventually decided the hole was it's let fdown, in fact, those are the exact ebay images

Here is a proof half crown from my collection for reference https://www.dropbox.com/sc/6diww245j07tymc/AABWLUuPteYuxJUV4ZLhX4Yya Rev https://www.dropbox.com/sc/d479r4p7ar47d4v/AABOj_MaseiJEo_8tWTrxpeya great discussion here by all contributors