What is a "BICYCLE STAMP"?

 

What is the "MINIMUM SIZE OF A BICYCLE ON A BICYCLE STAMP"

 Early attempts were made to attract attention by means of extraordinary bicycle constructions:

 MINIMUM-SIZE-OF-A-BICYCLE-ON-A-BICYCLE-STAMP-les-geants-du-cyclisme


Williams Bicycle Messenger Company – Louisville/USA

Williams-Bicycle-Messenger-Company-Louisville-Kentucky-1889-velo-Fahrrad-charges-paid-RE21048-stamp