The reason I ask is because 1788 is not a common date. It means that you are likely to pay more for it compared to a more common date in the same condition (1785 or 1791 according to the Numista member statistics that are visible in the date table).
Here is an example of a 1785 in similar condition (but with better eye appeal) that sold in 2020 for 155 eu: https://www.numisbids.com/sale/4200/lot/?lot=1191
…and a somewhat better 1791 recently for 240 euro: https://www.numisbids.com/sale/9319/lot/?lot=2036
… and a somewhat lower grade for 120 euro: https://www.numisbids.com/sale/7987/lot/?lot=4541
Ultimately, if you like it, think the price is fair, and can afford it … then go for it!