I was looking through the clearance page for collars here:
http://www.dog.com/clearance/collars-and-leads/
and the blue vintage collar caught my eye and I was planning on buying it but apparently it is not in stock anymore. I would be willing to do a "tradeoff" for said collar if anyone were to have the same collar in good condition that would fit an 18-inch neck. The trade-off means I would buy an item for the person and ship it to them through dog.com for the value of the collar before it was discounted.