In preparation for my video review of the Cohiba Lanceros for the 2017 Xmas Sampler Series, I researched pigtail caps on Cuban Cigars. I was unable to find a definitive reference on-line as to why or which cigars have a pigtail cap, but looking at the list below it's safe to infer some reasons...
The following Habanos cigars have (or had prior to discontinuation) pigtail caps:
Cohiba Lanceros
Cohiba Coronas Especiales
Montecristo Especial
Montecristo Especiales No.2
ALL Trinidad vitolas including the Fundadores and special releases such as the 2016 Topes Limited Edition and the recent 2017 LCDH La Trova
Davidoff No.1 and No.2
Hoyo de Monterrey Le Hoyo de Dauphin and Odeon
Vegueros Especiales No.1 and Especiales No.2
2011 Cohiba 1966 LE
2017 Cohiba Talisman
Cohiba Behike 52, 54 and 56
The main thing I can glean from the original size and purpose of the Cohiba Lanceros and Cohiba Coronas Especiales is the fact that they are both long and skinny 38 ring gauge cigars and were initially handed out as diplomatic and VIP gifts. Consequently, most of the cigars listed above are (or were) 38 ring gauge cigars. Trinidad as a marca was also a diplomatic cigar prior to being introduced publically in 1998. Trinidad was marketed as a premium marca and all vitolas have had pigtails. The Cohiba Behike 52, 54 and 56, introduced in 2010 as regular production cigars had pigtails and recently the Cohiba Limted Editions, the 1966 and Talisman have been released with pigtails.
I wonder if they've been constructed so to assist with clipping the cap without the use of a cutter. I had fun untwisting the pigtail cap on my 2017 Xmas Sampler Cohiba Lanceros today. If you'd like to see how it was done, follow the link below...