MackDigger
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Only thing I can figure. Size and shape look right ad it was a good 3inchs underground.
Headlamp Wiki said:The standardised 7-inch (178 mm) round sealed beam headlamp was introduced in 1940, and was soon required for all vehicles sold in the United States. Britain, Australia and other Commonwealth countries, as well as Japan, also made extensive use of 7-inch sealed beams. With some exceptions from Volvo and Saab, this headlamp size format was never widely accepted in continental Europe, leading to different front-end designs for each side of the Atlantic for decades.
The first halogen lamp for vehicle headlamp use, the H1, was introduced in 1962 by a European consortium of bulb and headlamp makers. Shortly thereafter, headlamps using the new light source were introduced. These were prohibited in the U.S., where sealed beam headlamps were required. In 1978, sealed beam headlamps with internal halogen burners became available for use in the United States. Halogen sealed beams now dominate the sealed beam market, though it is considerably smaller than it was before replaceable-bulb composite headlamps returned to the U.S. in 1983.