From Wikipedia:
“1966 300M
Intending to return the 300 letter series to its roots, Chrysler proposed the 1966 300M as a clay mockup in October 1963. The exterior was similar to the 300L, except the 300M had spinner-type knock off wheel covers with a "300M" medallion in the center, as well as another "300M" medallion on the trunk lid. The front running lights were moved to the center grille bar and the front turn signals were widened. The 300M also had paint stripes along the lower body line instead of the chrome molding found on the non-letter series 300s, "300M" medallions on the sides, script "Three Hundred" badges and unique tail lights and bezels. Three-spoke headlight ornaments were planned, but dropped due to legal issues in some states. The interior was identical to the non-letter series 300 except for the "300M" medallions. The 300M was planned to be powered by the 426 Wedge engine rated at 365 hp (272 kW). This first 300M proposal was cancelled in November 1964 "to reduce scheduling and plant complexity". But in 1965 the 300M was revived, this time powered by the 425 hp (317 kW), 426 Hemi engine and a planned production run of 4298, of which 500 were to have the Hemi engine, a $1250 option. The Hemi cars would also feature a dual-faced "7-Liter Hemi" medallion. This proposal was also cancelled as the letter series 300s had lost their prestige and exclusivity as they were simply non-letter series 300s with letter badges.”
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