Probably the earliest Collins Autopen pattern, seen used in 1966 and 1968.

This pattern is commonly seen on Apollo 11 first day covers and crew portraits.

This is the most commonly seen autopen pattern on Apollo 11 signed items (including covers in 1969 & 1979).

This topic is discussed in some detail on the Neil Armstrong page. To summarize briefly, during a period following the Apollo 11 mission someone at the Astronaut Office (likely not one of the astronaut secretaries) apparently produced a quantity of fake signatures of the Apollo 11 crew members in response to autograph requests in place of the usual Autopens.

A small number of these 'secretarials' were Mike Collins signatures, either as part of Apollo 11 crew signed items or on their own. A few examples of these 'secretarial' Collins signatures are shown below.