Is This Genuine And What's A Reasonable Offer? Spanish Silver W/ Chop Marks

I feel like I've seen that one or one like up up for auction in the not too distant past. May have been in a post or I just stumbled on it.

He calls it 'great detail' but the photos are poor and the date is scarcely visible?
Chopmarked coins of this series are not that scarce. Unless you are especially enamored of the marks on this one, I'd wait for a nicer example. Or make a low to middling offer.

Because these have been, and continue to be, counterfeited in great quantities, it's not really possible to determine if it's genuine from just photos of the obverse and reverse. You need an accurate weight and need to examine the edge carefully (a determination of specific gravity would be warranted on an example of any significant value).

The chopmarks would have been stamped on the coin by South Asian, primarily Chinese, money changers to certify that they had examined the coin and vouched for its silver content. The Chinese market was closed to outsiders until the Opium Wars of the mid-nineteenth century. Prior to that, the only import that was routinely accepted was silver and the preferred specie was the Spanish 8 reales. Several Western nations covertly issued unoffical restrikes of 8 reales in order to get the most value for their silver -- these are some of the hardest to distinguish from genuine issues.

I don't think the average dealer has the expertise to judge the authenticity with any great authority. Bob Gurney, who posts here as swamperbob, has written a book about these counterfeits called "The Un-real Reales". I highly recommend it for anyone interested in collecting portrait 8 reales of the Spanish Empire.

It's also worth noting that chop marks are still used to an extent. US $50 and $100 that leave the country in foreign commerce very frequently come back covered in little stamps.

But as for the coin in question, I do agree that you could perhaps do a little better for your money.