Hello
The city name is Isfahan but I can't make out the smith's mark.
The Kronfol collection was split between the National Museum of Scotland and the Musée des Beaux-Arts in Montreal,
I have just realized that the Musée des Beaux-Arts has posted a number of images with the names of some of the silversmiths although - frustratingly - there are no images of the stamps.
See
https://www.mbam.qc.ca/fr/collections/?q=kronfol
Either institution might be able to assist
Please post any additional information you come across
Thanks
Damon