$6.40 was the cost for 1,000 no trespassing posters, and Bonner complained it was a lot of money. $6.40 circa 1880 would equate to $141.54 in 2016. Printing similar posters via an online service in 2016 would cost about $3,500.
The script was originally used as an episode (also titled 'Duel at Lockwood') for the radio series "The Six-Shooter". It aired on March 21, 1954.