The Waring and Gillow tent, believed to have been made by the company's upholstery department in 1944, has been used in scenes of the new adaptation of the Poirot mystery Murder on the Orient Express.
The tent is now owned by Lewis Evans, formerly of Evans Marquee Hire, whose Arkholme based business Classic Canvas hires out antique tents to film and TV production companies.
Lewis, 53, who has been in the business with his brother Steven for 27 years, said he didn't even know he had himself a Waring and Gillow tent until he noticed the label on the Poirot set.
He said: "Whilst working on Foyle's War in May, I was contacted by producers of The Chronicles of Narnia, who were filming in Australia.
"A week later, six tents were on their way out there in a container.
"To fill the gap in my stock as the tents were going to be away for 18 weeks, I advertised in an ex-military vehicle collectors website for military tents and I ended up buying one from Kent.
"Even though I had this tent out in (BBC drama) Cranford I didn't spot the labels.
"But last week on Poirot I saw them all over each section of the tent."
Lewis, originally from Morecambe, has been running Classic Canvas for 11 months, and bought the tent for £150.
He added: "I've always liked historic things, so it's something I've drifted into, we've done all sorts, I'd tell you all the people who have been in our tents but I'd sound starstruck. "
Murder on the Orient Express, starring David Suchet as Poirot, is expected to be broadcast early next year.