 He was sophisticated in self-presentation, signing later prints with his name and town, and producing the first self-portrait print of himself and his wife, which was also the first portrait print of an identifiable person.Some plates seem to have been reworked more than once by his workshop, or produced in more than one version, and many impressions have survived, so his ability to distribute and sell his prints was evidently equally well developed.He was apparently the first to issue engraved (as opposed to woodcut) indulgences, apparently "bootlegged version[s] ... never subject to papal review"; one print promises 20,000 years reduction of time in Purgatory per set of prayers, increased in a second state to 45,000 years.