To most people, their license plate is slapped on the back of their car and largely forgotten about until it comes time to review.

Maybe if you've got a vanity plate you put a little more thought into your tags. But there are a small but dedicated group of collectors who collect license plates. Whether its a series of years, letter/number combinations or perhaps in some states, collecting all the counties, there are license plates to be sought out.

The license plate you see here, however, is beyond rare. One that hasn't been on a car. Rather it's what's known as a test place where paints are tried during the printing process.

The specimen was recently placed up for sale on Facebook. The plate was shared on the Michigan Licence Plates Facebook group where a member shared another test version of the Bridge plate with the letters printed in blue.

We took a search through eBay, and while there are a lot of Michigan license plates available for purchase, these color test plates are nowhere to be found.

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So if you are a collector, what are the best items in your collection, let us know in the comments.

No matter what plate you've got slapped on the backside of your ride, these are the roads across Michigan you've got to drive. Then keep going and check out the must-drive roads across America.

50 of Michigan's "Must-Drive" Roads

Gas up the car, grab those road munchies and a roadtrip partner that you can trust, and head out on some of Michigan's most unique roads and routes. Make sure you take lots of photos and video!

See the Must-Drive Roads in Every State

LOOK: See how much gasoline cost the year you started driving

To find out more about how has the price of gas changed throughout the years, Stacker ran the numbers on the cost of a gallon of gasoline for each of the last 84 years. Using data from the Bureau of Labor Statistics (released in April 2020), we analyzed the average price for a gallon of unleaded regular gasoline from 1976 to 2020 along with the Consumer Price Index (CPI) for unleaded regular gasoline from 1937 to 1976, including the absolute and inflation-adjusted prices for each year.

Read on to explore the cost of gas over time and rediscover just how much a gallon was when you first started driving.