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If it is a Fun Projects voltage regulator, John Regan the manufacturer said this in 2011 on the MTFCA forum.:
“All of our voltage regulators are easily discernible as to 6,8, or 12V as follows:
On the underside of the base the 8V units are stamped with a letter "A" while 12V units are stamped with a letter "B". No stamp at all and it is then a 6V unit. Positive ground Voltage Regulators have a steel washer in place of one of the center insulating washers. As pointed out - a rivet in one of the center locations designates that it is a cutout. Hope this helps.”
Look for a steel washer and no rivets in the center.