Eric Weinrabe said he has recently been on a roll, as is exemplified by the coin pictured here. It’s a very nice example of an English groat of Philip and Mary.
This isn’t a rare coin but in my experience half a dozen groats of Mary are found by detectorists for each one of Philip and Mary. Eric said his find was retrieved from a couple of inches deep in a Hertfordshire field mostly made up of very stony soil. It is therefore quite remarkable that it has survived in such good condition.
One quarter of the shield on the reverse is weak but overall the coin would grade nearly VF. It’s also a nice colour and provided this is natural and not due to cleaning then it would add value. If I was cataloguing it for sale at auction then I would set the pre-sale estimate at £320 – £380 and would expect the hammer price to be within that range.