Other factors like glass color, size, lid style, and other manufacturing marks may increase the value of a No. 13 jar, with some, like Ball's No. 13 half-pint jars, exceedingly rare, but still ...

And they're cheap—around $2.50 each for quart-size Ball jars and even less for pint-size. So it's understandably tempting to order a bunch when you're planning a wedding.