Purpose of the thread is to document the various designs used in this short time frame on the retail level. Background information, the first dial adjustables Gillette put on the market for sale were the serial Toggles and known sold dates were 1956 during Fathers day and Christmas and Fathers day of 1957 in Wisconsin as the test market. Christmas of 1957 they went nation and worldwide with the second variation on the Toggle. This Toggle was only produced in 2 known production runs with date codes of D1 and F4. The Red Dot Fat Boy followed afterwards in 1958. The Red Dot Fat Boy even though date coded D1, it was introduced for Father's day and also sold as a promotional razor for the 1958 world series. It was sold as the cheaper $1.95 razor until right before Father's Day of 1959 before being replaced by the standard Fat Boy. The Red dot was later reintroduced for the 4th quarter of 1960. You then had the Fat Boy Executive adjustable come onto the market in the 3rd quarter of 1958. Even though they have date codes from D3 - E2 the first known retail dates for the standard Fat Boy is May of 59 in time for Father's Day. The theory is the first ones to market were made with excess stock of base plates made for Executives.The Standard Fat Boy replaced the Red Dot Fat Boy as Gillette's $1.95 lower cost adjustable. The more expensive options were the $5.00 Executive and $10.00 Toggle. The Toggle, standard Fat Boy and Executive were sold continuously through the 4th quarter of 1960. In the 4th quarter of 1960 you had the brief reintroduction of the Red Dot Fat Boy, the limited run of Bottom Dial Fat Boys and third variation on the Toggle razor. Whether the third Toggle variation superseded the second or was sold along side them is unknown to me. By 1961 only one design ultimately won out which was the standard Fat Boy and from that point on Gillette only had on style of razor head for any adjustable regardless of model, handle or plating until 1988 when they stopped selling adjustable razors. You had 3 major razor head designs in use during this time period. First is what I'll call the Toggle mk2 design as can be seen here. The mk1 design is designated for the serial toggles prior to 1958. What makes it unique is the rectangular stamped base plate something you don't see again on an adjustable until the late 70s. It also has 5 teeth on each side of the lifter base plate. This razor head design is also used on the Red Dot Fat Boys with date codes D1, F4 and the Bottom Dial Fat Boys with F4 date codes. The next design is the Fat Boy design with the diamond stamped base plate and different lifter design. The Executive Fat Boy also shares the same razor head design. The last design is the mk3 Toggle design only seen on what are called chrome toggles known to be plated in gold and nickel. They have the rectangular stamped base plates but without any teeth on them and their adjuster dials are similar in design to the bottom dial fat boy and use a clicker spring like a standard Fat boy instead of a red dot.