They are from an old bike shop. 9/16 made in Belgium. The only markings are on the dust caps where it says Made in Belgium around the out side of the cap and on the inside it says JRC. Each pedal is a little different, but you have to look closely to see, if I recall the difference is the hole size on the inside pedal support. There were almost new and work very well.
There's bicycles in Belgium ?
I have seen rusty ones on eBay but they want way too much for them. There is a set of them on eBay for $25 but they are both right hand. They are JRC brand, 9/16 with dust caps so they can be rebuilt.