I wasn't able to use Chuck's link, but I think I saw these-do they have mismatched dustcaps? If so, and the one on the right has the correct cap (plain hemisphere, no "teeth" on circumfrence, allen fitting for removal) I think they're probably very early 60's or 50's. I have pictures of Campy pedals in a 1961 Cyclo-Pedia, and the #1037 Strada and #1038 Pista have this dustcap. Oddly, the #1038/1 Pista con Dente has the familiar (toothed with vent hole) variety.
Best Regards,
Wes Gadd
Unionville,CT