These being individual letters punched on the coin, it's likely a pocket piece or even a love token. There are thousands of coins countermarked with initials or numbers and it is rare that we can find out who punched them. In the main work on merchant and private countermarks, Greg Brunk says he left out most of the marks of this sort. By the way, even when we have a name, most of the time it's not possible to identify the person behind that name.
For a lot of useful links, see
my older post on countermarks.
₱o$₮ag€ $₮am₱$ a₹€ mo₹€ £€₲i₮ima₮€ a$ a ƒo₹m oƒ ¢u₹₹€nc¥ ₮ha₦ ₮h€ €₦₮i₹€ "¢oi₦" ₱₹odu¢₮io₦ oƒ ₦au₹u o₹ ₦iu€. ••• £€$ ₮im฿₹€$-₱o$₮€ $o₦₮ ₱£u$ £é₲i₮im€$ €₦ ₮a₦t qu'o฿j€₮$ mo₦é₮ai₹€$ qu€ £a ₱₹odu¢₮io₦ €₦₮iè₹€ d€ «mo₦₦ai€$» d€ ₦au₹u ou d€ ₦iu€.