What is value of a Pepsi promotional check signed by Richard Petty?

Richard Petty is a famous NASCAR driver who has endorsement deals with multiple companies which led to PepsiCo producing checks which would then be sent from NASCAR. The value for these checks will fluctuate widely based on a few key areas of the check; 1. Date (year that is on the check). 2. Race track location which is on the date line near the race number. 3. Drivers race number is located in the memo space above signature. Each area has variants which determine if a check has rarity or not which determines demand for the signed checks to increase or diminish. On average most Richard Petty PepsiCo checks range from $4.99 up to $49.99 with checks ranging between $50 dollars - $79.99 and above based on the three different value-adding aspects mentioned about these type of NASCAR promotional checks. Some notable higher amounts which they can fluctuate up are usually related to his very first years under team Petty as his career got started to his recent years in 2006-2007 in the NASCAR Sprint Series under Budweiser where the values can reach the higher levels noted earlier.