How can you tell what wattage a bulb is, if they are only identified by a part number?
I seen some 6 volt bulbs on e-bay, but they don't have what size the wattage is (brightenss)

CP or Candle Power is the more common means of rating bulbs.

You can look up lamps by part number in Chicago Miniature Lamp Co's. page.
http://www.sli-lighting.com/cml/electronic/search.cfm
To determine the lamp wattage you multiply the voltage times the amps.

Hey 26chevy! that is a fine looking peddlers wagon on your profile! (that is what we called them back home in the skeets at Kamay, Texas where I was raized)I noticed the Benbrook on your last post. I come thru ever month on my way to Arlington from DeLeon to the Lone Star Region of VCCA meeting on the second Sunday every month (except June) for our meetings. Load up the family or come alone next Sunday the meeting starts at 2:30 PM at the Sr. Citizens center at 1000 Eunice St. in Arlington and take a peek at the LSR web page at http://www.lsrclub.org