I have been buying and collecting antiques for over 30 years. A few years ago I opened a shop on ETSY, selling vintage pen knives under the name UKSteelCityVintage. I also sell Antiques and Militaria from Elsecar Heritage Centre which is based in Barnsley.
Sheffield was the heart of the knife making industry. I am from Sheffield myself so 90% of the vintage pen knives I am selling are from Sheffield.