It is designed to run modern 700c rims. From searching the web, I believe it's a mid 1960's build.
Thule Spare Key's Genuine All Numbers Available No 1-199 Roof Rack Bars
Thule Spare Keys Genuine All Numbers Available No 1-200
NOS Vintage adidas STI 1 Systeme 3 Cycling Shoes EDDY MERCKX 40 - 6 1/2
NOS Vintage adidas STI 1 Systeme 3 Cycling shoes EDDY MERCKX 37 1/3
PAIR VINTAGE ROADSTER 26x1 1/2 (584) CHROME BIKE RIMS WESTRICK ROD OR CALIPER
NOS Vintage adidas STI 1 Systeme 3 Cycling Shoes EDDY MERCKX 40 2/3- 7