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MikeEarly examples (1950's) are traditional in character formation, with a heavier right slant. The beginning stroke, during the 50's, began at the top of the letter with a small hook before the first loop. The stroke that formed the character began to incorporate loops which gradually increased in size and flamboyance. By the 60's, the character had become much rounder in appearance with the opening stroke beginning to exhibit a large loop formation. The late 1960's saw the loop gradually beginning to dip below the signature line, and by the 1970's the formation became established as a distinct characteristic of his autograph. The opening of the his last signatures extended below the base line and as far as the "i" in Mickey. The width of the descending loop is inconsistent and the 'M" may or may not connect to the "i".
Hopefully you can date your signature from the above. Good luck. Sounds like yours is the 60's.