Hi antoni
Welcome to the forum, Even without pictures I can tell you with absolute confidence that they are " modern " copies or reproductions. Some were made by Dodo and Garnier in the 1980's and others for retailing from the Guinness shops linked to the Guinness Brewery in Ireland.
The designs you mention were never made as Original enamel signs, only as laminated showcards which date from the 50's and 60's. These designs have been variously copied over the years some as decorative pieces to be sold as such and some made to deceive. Sensible values these days probably £40 to £60 each.
Cheers lummox