73, 74 in 6 days 
no not really
Back to the ALL IMPORTANT (yeah, right?) topic of the TO220. Yesterday I was looking at my bookshelf and took out a TI Power Databook from about 1973. I looked at datasheets for TIP series power transistors. They do not say anything obvious about their package being different, but I think a sharp eye can pick out the edge of the metal slab running the full length of the package.
BTW I also have an old GE Semiconductor databook. It has datasheet pages describing devices such as D44C5 ācolor moldedā power transistors. Red for NPN and Green for PNP. I could post a scan of either of these but given that they are pages in books, I do not expect the scan results to be great. This GE book is a large paperback which is partially held together with tapeā¦
Ah yes, the colours were cute. I think mine came from a grab bag sold by a company in Texas. At the itme I wished epoxy packages could be more colourful instead of boring black. There was the occasional grey one.
Nixies are just about to have their 74th birthday???
I have some pre-loved Japanese transistors in green. 2SAs & 2SBsā¦ PNPs, scavenged from something or other. I thought they may be of use one day.
Also have some TO220ish (round, goldish colored pins) GE TRIACs in a very pretty light blue. 
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