Question: What is similar in the American reality television series airing on the History Channel Produced by Leftfield Pictures and "Pawn Stars"?

Context articles: List of American Restoration episodes
Richard Benjamin Harrison
Chumlee
American Restoration
Counting Cars
Pawn Stars UK
Cajun Pawn Stars
New Money (TV series)
Pawn Stars
List of Hardcore Pawn episodes

"American Restoration" is an American reality television series airing on the History channel.
 Produced by Leftfield Pictures, the series is filmed in Las Vegas, Nevada, where it chronicles the daily activities at "Rick's Restorations", an antique restoration store, with its owner Rick Dale, his staff, and teenage son, as they restore various vintage items to their original condition.
Richard Benjamin Harrison Jr., (also known by the nicknames The Old Man and The Appraiser) (born March 4, 1941), is a Las Vegas businessman and reality television personality, best known as the co-owner of the World Famous Gold & Silver Pawn Shop, as featured on the History channel series "Pawn Stars".
 Harrison was the co-owner of a pawn shop with his son Rick Harrison until he suffered a stroke, causing him to retire.They opened the store together in 1989.
Austin Lee Russell (born September 8, 1982), better known by his stage name of Chumlee, is an American actor, businessman and reality television personality, known as a cast member on the History Channel television show "Pawn Stars", which depicts the daily business at the Gold and Silver Pawn Shop in Las Vegas where Russell works as an employee.
 Chumlee came to work at the pawn shop five years before filming of the first season, having been a childhood friend of Corey Harrison, whose father, Rick Harrison, and grandfather, Richard Benjamin Harrison, opened the shop in 1989.
American Restoration is an American reality television series airing on the History channel.
 Produced by Leftfield Pictures, the first six seasons were recorded in Las Vegas, Nevada, where it chronicled the daily activities at "Rick's Restorations", an antique restoration shop, with its owner Rick Dale, his staff, and teenage son, as they restore various vintage items to their original condition.
Counting Cars is an American reality television series, shown on History, and produced by Leftfield Pictures.
 The series, which is the third spinoff of "Pawn Stars", is filmed in Las Vegas, Nevada, where it chronicles the daily activities at Count's Kustoms, an automobile restoration and customization company owned and operated by Danny Koker, who previously appeared as a recurring expert on "Pawn Stars".
 In a format similar to another "Pawn Stars" spinoff, "American Restoration", the series follows Koker and his staff as they restore and modify classic automobiles and motorcycles.
 "Counting Cars" debuted on August 13, 2012.
Pawn Stars UK is a British reality television series which debuted on 26 August 2013 on the British version of the History channel.
 The series is filmed in Sealand, Flintshire in Wales, and chronicles the day-to-day activities of pawn shop Regal Pawn, collaboratively run by Mark Andrew Manning, Mark Lever Holland, Marco Peter Holland, Simon Penworth, and Vicki Manning.
Cajun Pawn Stars is an American reality television series on the History channel that debuted January 8, 2012, at 10 pm ET.
New Money is an American reality television series that premiered on May 29, 2015 on the E! cable network.
 The six-part series documents how the extremely rich spend their money and the lifestyles they lead.
 The series is produced by Leftfield Pictures.
Pawn Stars is an American reality television series, shown on History, and produced by Leftfield Pictures.
 The series is filmed in Las Vegas, Nevada, where it chronicles the daily activities at the World Famous Gold & Silver Pawn Shop, a 24-hour family business opened in 1989 and operated by patriarch Richard "Old Man" Harrison, his son Rick Harrison, Rick's son Corey "Big Hoss" Harrison, and Corey's childhood friend, Austin "Chumlee" Russell.
 The series, which became the network's highest rated show and the No. 2 reality show behind "Jersey Shore", debuted on July 26, 2009.
"Hardcore Pawn" is an American reality television series airing on truTV that follows the day-to-day operations of American Jewelry and Loan, a family-owned and operated pawn shop in Detroit, Michigan's 8 Mile Road corridor.
 The series, which was preceded by two pilot episodes in 2009, premiered on August 16, 2010.