yes, the 44re:creation Stargazer is released earlier than Sleipnir but the Yoyorecreation Stargazer no, is next, even if very little.
I am only comparing the models in relation to each other in terms of their physical characteristics. When they came out is irrelevant.
The formula is: A is to B as C is to D
Hot:Cold :: Happy:Sad
Type?
Has anyone here tried the Sigtyr? What do you think? 
See my comments above. I really like my Sigtyr. I think it is just a bit better than the Valkyrie; but not as good as the Draupnir.