Black pick is late '80s Steve. Chrome plated ones were earlier, The one you have has been filed a lot in comparison to how hard they are and hpw long would last. The red one below is a second gen. Dbl spike was not common. I never saw one imported into the NA. Climb high in the US and MEC in Canada were th importers.
New picks and different Simond tools. I think the axe was called a Mustang but I'd need to look it up. When you have a spare pick in your hand it is clear what Gordon Smith was saying about flipping a standard curved pick oevr and drilling it as a reverse curve pick. Easy if you had the tools and the blanks sitting there. Some one was thinking :) Instant, giant size, Terrodactyl. Brilliant! That the new picked worked so well had to be a surprise to everyone.
Barracuda (with a Chacal) soloing on the approach slopes of Polar Circus in '84. Right about the time the Barracuda was first imported to the US. But they were available by '81 or '82 in France and the UK.
Notably used on Taulliraju (Peru ), South Face, by Mick Fowler and Chris Watts in '82. Check out the 2nd ascent in in 2003 AAJ. Impressive climb!
"From the posts in this thread an observation one might make is that it was Hamish McInnes and his Terro that made the biggest impression on modern ice and mixed climbing."
Here is a second answer to the same question. Hopefully the picture will be more definative.
In effect not a lot has changed from the original Terrodactyls. The handles and picks have gotten longer and more ergonomic but past that...really not much. Slight improvements on the Terro...not all that impressive when you look at the actual lineage. Biggest advantage is the additional clearence that has been with each new generation.
As a comparison Black Diamond offers 4 technical tools. All with about a 2 degree change in pick angle between each of the 4 tools. About 10 degrees over all last I heard. (Reactor, Viper, Cobra Fusion) No where near that much differeence between the originals Terros, the Chacal and the Nomic.
Anyone that originally climbed hard with a Terrordactyl could very easily switch to a current Nomic and climb much, much harder with a lot less effort. And.....more security. If you liked a Terro, a new Ergo would make you think it true bliss by comparison. At some point the newest tools just becomes cheating :) But even the Ergo is just a Terro with more clearence than a Nomic.