However, there was a company called Martian Metals, they had upside down ads in Dragon magazine, and they did the first 15mm Traveller of which I'm aware. Badly done, as we've all agreed.
Yes, they did exist, and as a rule their human figures were ugly, I kinda like their K'Kree figures, which to be honest are ugly as well. If they hadn't burned down I suspect with time they would have gotten better.
But, as far as I can tell Martian Metals and the RAFM/Citadel figures all came out in the early 80s as to which was first I would have go look at my copies of jTas to see which ads came out 1st.
Most of the RAFM/Citadel line and the MM Grav tank are currently available from
RAFM which leads me to believe that RAFM was producing both lines too some extent in Canada.
Though the funny thing is that the closest to the Iconic Marines from DGP and Grenadier in 15mm are Ground Zero Games UNSC Hardsuits. (Jon has stated more than once that Traveller was a heavy inspiration for a lot of his early Games and Miniatures, so one shouldn't be surprised).