I just smelted down the last batch of ww I got. Had only 2 of the standard ww that did not melt @ 600 degrees, but had a bunch of the tape on type that didn't. All of the tape on type had only a numeral on the individual weight, and some had nothing. All of the lead (hopefully lead, I haven't melted these yet) ones had the weight in gms and 1/4 oz on them. There's a strong visual difference between them.
Anyone else noticed this?