What an amazing piece of history. The leather appears to be cowhide, that is very thick and stiff. They may have been used from some of the wear marks I can see, but not completely sure. These are amazing and they just wouldn't look right on my 2003 motorcycle.
They need a vintage bike, a classic bobber, lowrider, or bad biker to own. They could also be used on a horse, or bike. There is no maker mark that I can find, no year or indication, but you WILL NEVER see these piratey themed ones again, I would bet.
The item "Skull & Crossbones Custom Leather Motorcycle bike horse Saddlebags black vintage" is in sale since Thursday, June 28, 2018. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Accessories\Luggage\Other Luggage". The seller is "hey-man-dave" and is located in Seattle, Washington. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Croatia, Malaysia, Colombia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion.