I recently got OS shave mug from ebay for my son. However when i got it, its small. Is this how they all are or did i get a something else? Says made in Belgium on bottom. I was looking for one the size of the COL Conk large mug, disappointed.
Pic or diameter? Mine (from early sixties I think) is maybe a half inch larger than a Col. Conk puck if that helps. Made in Belgium is cool though.
http://www.oldspicecollectibles.com/Mugs/England.html
More info from that site shows that the majority (including the Belgian mugs) measure "4.5 inches from rim to handle". So it's normal.
Looks like from the 70's (http://www.oldspicecollectibles.com/Mugs/American%20Glass.html) The ridges are to hold the puck firmly in place.