The “olive drab” paint color and stenciled “TP26” leads me to think it might be a former Army fleet vehicle. headscratch

The stencil IMO is definitely to ID tire pressure from my experience with Army fleet equipment.

Welcome to Stovebolt! thumbs_up I’m pretty sure you’ve been bitten by the Stovebolt bug - lol! grin

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)